diff --git a/src/client/components/fileCard.tsx b/src/client/components/fileCard.tsx
index 8b45846..d9d6223 100644
--- a/src/client/components/fileCard.tsx
+++ b/src/client/components/fileCard.tsx
@@ -1,5 +1,5 @@
 import { memo, useEffect, useState, type ChangeEvent, type ComponentType, type MouseEvent, type ReactElement } from 'react'
-import { absPathOf, displayPathOf, glyphOf } from '../fileActivity'
+import { absPathOf, baseNameOf, displayPathOf, glyphOf } from '../fileActivity'
 import type { FileActivity, FileEntry, FileOp, FileOpKind } from '../fileActivity'
 import type { ContextSettings, DefaultFileSort } from '../settings'
 import type { DetailState } from '../timelineSource'
@@ -74,13 +74,21 @@ export function makeFileCard(kit: ViewKit, settings: ContextSettings): Component
     // Count sort magnitude: the selected kind's own ops under a kind chip, else the file's overall op count.
     const countOf = (e: FileEntry): number =>
       filter === 'read' ? e.reads : filter === 'write' ? e.writes : filter === 'search' ? e.searches : e.ops.length
+    // Name sort: the displayed last segment leads, the full path breaks ties between same-named files.
+    const byName = (a: FileEntry, b: FileEntry): number => {
+      const an = baseNameOf(displayOf(a))
+      const bn = baseNameOf(displayOf(b))
+      return an !== bn ? (an < bn ? -1 : 1) : (a.path < b.path ? -1 : 1)
+    }
     const shown = activity.entries
       .filter(e => matches(e, filter) && (q === '' || displayOf(e).toLowerCase().includes(q)))
       .sort((a, b) => sort === 'count'
         ? (countOf(b) - countOf(a)) || (b.ops[0].seq - a.ops[0].seq)
         : sort === 'latest'
           ? b.ops[0].seq - a.ops[0].seq
-          : (a.path < b.path ? -1 : 1))
+          : sort === 'name'
+            ? byName(a, b)
+            : (a.path < b.path ? -1 : 1))
 
     const chips: { key: FileFilter; files: number; ops: number }[] = [
       {
@@ -165,7 +173,7 @@ export function makeFileCard(kit: ViewKit, settings: ContextSettings): Component
               </span>
             ) : null}
             <span className="lc-gran lc-fa-sort" role="group" title={t('files.sortTip')}>
-              {(['count', 'latest', 'path'] as const).map(k => (
+              {(['count', 'latest', 'path', 'name'] as const).map(k => (
                 <button
                   key={k}
                   type="button"
diff --git a/src/client/components/settingsCard.tsx b/src/client/components/settingsCard.tsx
index b9527ef..ca12dca 100644
--- a/src/client/components/settingsCard.tsx
+++ b/src/client/components/settingsCard.tsx
@@ -199,6 +199,7 @@ function PreferenceRows(props: { t: Translate; state: SettingsState; set?: Setti
             { id: 'count', label: t('files.sort.count') },
             { id: 'latest', label: t('files.sort.latest') },
             { id: 'path', label: t('files.sort.path') },
+            { id: 'name', label: t('files.sort.name') },
           ]}
           onPick={(id) => { set?.('defaultFileSort', id) }}
         />
diff --git a/src/client/fileActivity.ts b/src/client/fileActivity.ts
index 3c0eba8..fd61a16 100644
--- a/src/client/fileActivity.ts
+++ b/src/client/fileActivity.ts
@@ -10,6 +10,7 @@
 
 import type { FileOpRecord, RequestRecord, SurfaceNode } from '../shared/types'
 import { opsOfCall, parseCallArgs } from '../shared/fileOps'
+import { leafNameOf } from '../shared/attachment'
 // The harness's browser-safe file-address layer, inlined by the client bundle:
 // the produced address is the `dsh-resource://file/…` spelling the preview claims.
 import { fileAddressFor } from '@deepseek-ai/dsh-util-workspace-path'
@@ -152,10 +153,14 @@ function fileGlyph(base: string): FileGlyph {
   return { glyph: '📄', tip: 'files.form.text' }
 }
 
+/** The last segment of a path, either separator style, a trailing slash trimmed first. */
+export function baseNameOf(path: string): string {
+  return leafNameOf(path.endsWith('/') ? path.slice(0, -1) : path)
+}
+
 export function glyphOf(path: string, form: FileForm): FileGlyph {
   if (form === 'image') return { glyph: '🖼', tip: 'files.form.image' }
-  const trimmed = path.endsWith('/') ? path.slice(0, -1) : path
-  const base = trimmed.slice(trimmed.lastIndexOf('/') + 1)
+  const base = baseNameOf(path)
   return form === 'dir' ? dirGlyph(base) : fileGlyph(base)
 }
 
diff --git a/src/client/i18nEn.ts b/src/client/i18nEn.ts
index d584954..3c7d11f 100644
--- a/src/client/i18nEn.ts
+++ b/src/client/i18nEn.ts
@@ -162,7 +162,8 @@ export const DICT_EN = {
   'files.sort.count': 'Most active',
   'files.sort.latest': 'Latest',
   'files.sort.path': 'By path',
-  'files.sortTip': 'Sort files by operation counts (of the selected kind when a kind chip is active), most recent activity, or path',
+  'files.sort.name': 'By name',
+  'files.sortTip': 'Sort files by operation counts (of the selected kind when a kind chip is active), most recent activity, path, or file name',
   'files.files': '{n} files',
   'files.deltaTip': 'Cumulative line change estimated from edit/write call arguments: + added / − removed',
   'files.empty': 'No file reads, writes, or searches in this range',
diff --git a/src/client/i18nZh.ts b/src/client/i18nZh.ts
index 7cae472..c93916f 100644
--- a/src/client/i18nZh.ts
+++ b/src/client/i18nZh.ts
@@ -160,7 +160,8 @@ export const DICT_ZH = {
   'files.sort.count': '按次数',
   'files.sort.latest': '按最新',
   'files.sort.path': '按路径',
-  'files.sortTip': '文件排序：按操作次数（选中分类时按该分类的次数）、最近操作时间或路径',
+  'files.sort.name': '按文件名',
+  'files.sortTip': '文件排序：按操作次数（选中分类时按该分类的次数）、最近操作时间、路径或文件名',
   'files.files': '{n} 个文件',
   'files.deltaTip': '按 edit/write 调用参数估算的累计行数变化：+ 新增 / − 删除',
   'files.empty': '该范围内没有文件读取、写入或搜索操作',
diff --git a/src/client/settings.ts b/src/client/settings.ts
index 643b92b..27bb9e4 100644
--- a/src/client/settings.ts
+++ b/src/client/settings.ts
@@ -76,7 +76,7 @@ function prefsOf(value: unknown): Prefs {
     ...(v.defaultTrendMode === 'total' || v.defaultTrendMode === 'delta' ? { mode: v.defaultTrendMode } : {}),
     ...(v.defaultDeltaBase === 'step' || v.defaultDeltaBase === 'turn' ? { deltaBase: v.defaultDeltaBase } : {}),
     ...(v.defaultToolSort === 'size' || v.defaultToolSort === 'count' || v.defaultToolSort === 'name' ? { toolSort: v.defaultToolSort } : {}),
-    ...(v.defaultFileSort === 'count' || v.defaultFileSort === 'latest' || v.defaultFileSort === 'path' ? { fileSort: v.defaultFileSort } : {}),
+    ...(v.defaultFileSort === 'count' || v.defaultFileSort === 'latest' || v.defaultFileSort === 'path' || v.defaultFileSort === 'name' ? { fileSort: v.defaultFileSort } : {}),
     ...(v.insightsEntry === 'show' || v.insightsEntry === 'hide' ? { insightsEntry: v.insightsEntry } : {}),
     ...(v.defaultDurationCurve === 'show' || v.defaultDurationCurve === 'hide' ? { durationCurve: v.defaultDurationCurve } : {}),
     ...(v.fleetTab === 'show' || v.fleetTab === 'hide' ? { fleetTab: v.fleetTab } : {}),
diff --git a/src/host/config.ts b/src/host/config.ts
index aec0f02..0602773 100644
--- a/src/host/config.ts
+++ b/src/host/config.ts
@@ -52,7 +52,7 @@ export const Config = z.object({
   defaultTrendMode: volatileField(z.union(['total', 'delta']).default('total').loose()),
   defaultDeltaBase: volatileField(z.union(['step', 'turn']).default('step').loose()),
   defaultToolSort: volatileField(z.union(['size', 'count', 'name']).default('count').loose()),
-  defaultFileSort: volatileField(z.union(['count', 'latest', 'path']).default('count').loose()),
+  defaultFileSort: volatileField(z.union(['count', 'latest', 'path', 'name']).default('count').loose()),
   insightsEntry: volatileField(z.union(['show', 'hide']).default('show').loose()),
   defaultDurationCurve: volatileField(z.union(['show', 'hide']).default('show').loose()),
   fleetTab: volatileField(z.union(['show', 'hide']).default('show').loose()),
diff --git a/src/shared/types.ts b/src/shared/types.ts
index d377542..05e2113 100644
--- a/src/shared/types.ts
+++ b/src/shared/types.ts
@@ -152,7 +152,7 @@ export type DefaultTrendMode = 'total' | 'delta'
 /** The browser delta baseline: against the immediately preceding record, or the previous turn's last step. */
 export type DefaultDeltaBase = 'step' | 'turn'
 
-export type DefaultFileSort = 'count' | 'latest' | 'path'
+export type DefaultFileSort = 'count' | 'latest' | 'path' | 'name'
 
 export type DefaultToolSort = 'size' | 'count' | 'name'
 
diff --git a/tests/client/components/fileCard.spec.ts b/tests/client/components/fileCard.spec.ts
index 3295f1e..69fe3d1 100644
--- a/tests/client/components/fileCard.spec.ts
+++ b/tests/client/components/fileCard.spec.ts
@@ -226,11 +226,11 @@ describe('FileCard — header, rows, and filters', () => {
     await m.unmount()
   })
 
-  test('the sort toggle defaults to most-active and switches to latest and path', async () => {
+  test('the sort toggle defaults to most-active and switches to latest, path, and name', async () => {
     const m = await mount(h(FileCard, { activity: richActivity(), scope: 'live' }))
     const titles = () => queryAll(m.container, '.lc-fa-row').map(r => r.title)
     const sortBtns = queryAll(m.container, '.lc-fa-sort .lc-gran-btn')
-    assert.equal(sortBtns.length, 3)
+    assert.equal(sortBtns.length, 4)
     assert.ok(sortBtns[0].className.includes('lc-gran-on'))
     assert.deepEqual(titles(), ['/var/many.log', '/src/a.ts', '/shots/ui.png', 'solo.md', '/src/'])
     // Latest order: many.log (seq 28) → ui.png (9) → solo.md (8) → a.ts (7) → /src/ (6).
@@ -241,12 +241,36 @@ describe('FileCard — header, rows, and filters', () => {
     await click(sortBtns[2])
     assert.ok(sortBtns[2].className.includes('lc-gran-on'))
     assert.deepEqual(titles(), ['/shots/ui.png', '/src/', '/src/a.ts', '/var/many.log', 'solo.md'])
+    // Name order: ascending over the last segment (a.ts → many.log → solo.md → src → ui.png).
+    await click(sortBtns[3])
+    assert.ok(sortBtns[3].className.includes('lc-gran-on'))
+    assert.deepEqual(titles(), ['/src/a.ts', '/var/many.log', 'solo.md', '/src/', '/shots/ui.png'])
     await click(sortBtns[0])
     assert.ok(sortBtns[0].className.includes('lc-gran-on'))
     assert.deepEqual(titles(), ['/var/many.log', '/src/a.ts', '/shots/ui.png', 'solo.md', '/src/'])
     await m.unmount()
   })
 
+  test('the name sort leads with the last segment and breaks ties on the full path', async () => {
+    const readOne = (seq: number, path: string): FileEntry => entry(path, { reads: 1, ops: [fileOp(seq, 'read', 'read')] })
+    const activity: FileActivity = {
+      entries: [
+        readOne(4, '/b/x.ts'),
+        readOne(3, '/d/x.ts'),
+        readOne(2, '/a/x.ts'),
+        readOne(1, '/a/z.ts'),
+        readOne(5, 'C:\\repo\\x.ts'),
+      ],
+      totals: { read: { files: 5, ops: 5 }, write: { files: 0, ops: 0 }, search: { files: 0, ops: 0 }, image: { files: 0, ops: 0 }, added: 0, removed: 0 },
+    }
+    const m = await mount(h(FileCard, { activity, scope: 'live' }))
+    const sortBtns = queryAll(m.container, '.lc-fa-sort .lc-gran-btn')
+    await click(sortBtns[3])
+    // x.ts groups ahead of z.ts by leaf (backslash leaves count); within one leaf, the full path ascends.
+    assert.deepEqual(queryAll(m.container, '.lc-fa-row').map(r => r.title), ['/a/x.ts', '/b/x.ts', '/d/x.ts', 'C:\\repo\\x.ts', '/a/z.ts'])
+    await m.unmount()
+  })
+
   test('the mount-time default sort comes from the plugin settings', async () => {
     const titles = (container: ParentNode) => queryAll(container, '.lc-fa-row').map(r => r.title)
     const sortBtns = (container: ParentNode) => queryAll(container, '.lc-fa-sort .lc-gran-btn')
@@ -263,6 +287,12 @@ describe('FileCard — header, rows, and filters', () => {
     assert.deepEqual(titles(m.container), ['/shots/ui.png', '/src/', '/src/a.ts', '/var/many.log', 'solo.md'])
     await m.unmount()
 
+    settings.set('defaultFileSort', 'name')
+    m = await mount(h(FileCard, { activity: richActivity(), scope: 'live' }))
+    assert.ok(sortBtns(m.container)[3].className.includes('lc-gran-on'))
+    assert.deepEqual(titles(m.container), ['/src/a.ts', '/var/many.log', 'solo.md', '/src/', '/shots/ui.png'])
+    await m.unmount()
+
     // The stored preference resets the default; in-card toggling never writes back.
     settings.set('defaultFileSort', 'count')
     m = await mount(h(FileCard, { activity: richActivity(), scope: 'live' }))
diff --git a/tests/client/components/settingsCard.spec.ts b/tests/client/components/settingsCard.spec.ts
index 1ee0f29..0cc31d7 100644
--- a/tests/client/components/settingsCard.spec.ts
+++ b/tests/client/components/settingsCard.spec.ts
@@ -185,8 +185,9 @@ describe('PluginConfigCard (the Plugins-page seat)', () => {
       DICT_EN['files.sort.count'],
       DICT_EN['files.sort.latest'],
       DICT_EN['files.sort.path'],
+      DICT_EN['files.sort.name'],
     ])
-    await click(sortItems[2]) // 'By path'
+    await click(sortItems[3]) // 'By name'
     assert.deepEqual(calls, [
       ['defaultPlacement', 'sidebar'],
       ['insightsEntry', 'hide'],
@@ -196,7 +197,7 @@ describe('PluginConfigCard (the Plugins-page seat)', () => {
       ['defaultDurationCurve', 'hide'],
       ['defaultDeltaBase', 'turn'],
       ['defaultToolSort', 'name'],
-      ['defaultFileSort', 'path'],
+      ['defaultFileSort', 'name'],
     ])
     assert.equal(document.body.querySelector('[role="menu"]'), null)
 
diff --git a/tests/client/fileActivity.spec.ts b/tests/client/fileActivity.spec.ts
index 87f6d78..7acbfe8 100644
--- a/tests/client/fileActivity.spec.ts
+++ b/tests/client/fileActivity.spec.ts
@@ -606,6 +606,10 @@ describe('glyphOf', () => {
     for (const [path, glyph, tip] of cases) assert.deepEqual(glyphOf(path, 'dir'), { glyph, tip }, path)
   })
 
+  test('a Windows-style path keys on its backslash leaf too', () => {
+    assert.deepEqual(glyphOf('C:\\repo\\.gitignore', 'text'), { glyph: '🚫', tip: 'files.glyph.ignore' })
+  })
+
   test('files resolve special names before extensions, and buckets before the fallback', () => {
     const cases: [string, string, string][] = [
       ['pnpm-lock.yaml', '🔒', 'files.glyph.lock'],
diff --git a/tests/client/settings.spec.ts b/tests/client/settings.spec.ts
index 1d0f348..2b9d70c 100644
--- a/tests/client/settings.spec.ts
+++ b/tests/client/settings.spec.ts
@@ -393,9 +393,9 @@ describe('attach', () => {
     scope.emit({ status: 'ready', value: { defaultGranularity: 'turn', defaultTrendMode: 'delta' }, writable: true })
     assert.equal(calls, 2)
     assert.equal(s.defaultTrendMode(), 'delta')
-    scope.emit({ status: 'ready', value: { defaultFileSort: 'path' }, writable: true })
+    scope.emit({ status: 'ready', value: { defaultFileSort: 'name' }, writable: true })
     assert.equal(calls, 3)
-    assert.equal(s.defaultFileSort(), 'path')
+    assert.equal(s.defaultFileSort(), 'name')
     scope.emit({ status: 'ready', value: { defaultPlacement: 'sidebar' }, writable: true })
     assert.equal(calls, 4)
     assert.equal(s.defaultPlacement(), 'sidebar')