diff --git a/cypher-executor/src/routes/console-dashboard.ts b/cypher-executor/src/routes/console-dashboard.ts
index 4a5034a..ef22ec6 100644
--- a/cypher-executor/src/routes/console-dashboard.ts
+++ b/cypher-executor/src/routes/console-dashboard.ts
@@ -522,13 +522,13 @@ consoleDashboardRouter.post('/console/triage-check', async (c) => {
   return c.json({ success: true, entry_id: entryId, action, status: action === 'restore' ? 'new' : 'done' });
 });
 
-function renderDashboardHtml(): string {
+function renderDashboardHtml(brand: string): string {
   return `<!doctype html>
 <html lang="zh-Hant">
 <head>
 <meta charset="utf-8"/>
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<title>Mira 駕駛艙</title>
+<title>${brand} 駕駛艙</title>
 <script>
   // 主題預載（防閃色）：預設淺色（leo 2026-07-04 明示），與 /console 共用同一 localStorage key
   document.documentElement.setAttribute('data-theme', (function () {
@@ -620,7 +620,7 @@ function renderDashboardHtml(): string {
 <body>
 <main>
   <div class="pagehead">
-    <div class="title serif">Mira<small>　駕駛艙</small></div>
+    <div class="title serif">${brand}<small>　駕駛艙</small></div>
     <div style="display:flex;align-items:baseline">
       <div class="date serif" id="date-str"></div>
       <button class="theme-btn" id="theme-btn" title="切換深/淺色">☾</button>
@@ -813,4 +813,5 @@ function renderDashboardHtml(): string {
 }
 
 // GET /console/dashboard — 駕駛艙頁（無需登入；純渲染 dashboard-data，無互動、無說明文字）
-consoleDashboardRouter.get('/console/dashboard', (c) => c.html(renderDashboardHtml()));
+// 品牌字樣（Arcrun#21）：引擎預設 Arcrun，實例可用 CONSOLE_BRAND 覆蓋（如 "Arcrun RAG"）
+consoleDashboardRouter.get('/console/dashboard', (c) => c.html(renderDashboardHtml(c.env.CONSOLE_BRAND || 'Arcrun')));
diff --git a/cypher-executor/src/routes/console.ts b/cypher-executor/src/routes/console.ts
index 3d36ecd..072011b 100644
--- a/cypher-executor/src/routes/console.ts
+++ b/cypher-executor/src/routes/console.ts
@@ -63,13 +63,13 @@ import { TAIPEI_CLIENT_JS } from '../lib/taipei-time';
 
 export const consoleRouter = new Hono<{ Bindings: Bindings }>();
 
-function renderConsoleHtml(registryBase: string): string {
+function renderConsoleHtml(registryBase: string, brand: string): string {
   return `<!doctype html>
 <html lang="zh-Hant">
 <head>
 <meta charset="utf-8"/>
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<title>Mira Console</title>
+<title>${brand} Console</title>
 <script>
   // 主題預載（防閃色）：預設淺色（leo 2026-07-04 明示），選擇存 localStorage
   document.documentElement.setAttribute('data-theme', (function () {
@@ -292,7 +292,7 @@ function renderConsoleHtml(registryBase: string): string {
 <div class="authwrap view" id="v-login">
   <div class="authbox">
     <div>
-      <div class="brand">Mira</div>
+      <div class="brand">${brand}</div>
       <div class="brand-sub">私人系統・僅供擁有者進入</div>
     </div>
     <div style="display:flex;flex-direction:column;gap:12px;text-align:left">
@@ -311,7 +311,7 @@ function renderConsoleHtml(registryBase: string): string {
 <div class="authwrap view" id="v-setup">
   <div class="authbox" style="max-width:440px;text-align:left">
     <div style="text-align:center">
-      <div class="brand" style="font-size:38px">Mira</div>
+      <div class="brand" style="font-size:38px">${brand}</div>
       <div class="serif" style="margin-top:12px;font-size:21px">首次設定</div>
       <div style="margin-top:8px;font-size:15px;color:rgba(var(--ink-rgb),.55);line-height:1.7">系統偵測到尚未設定擁有者帳號。<br>設定一組 Email 與密碼，之後只有你能進入。</div>
     </div>
@@ -329,7 +329,7 @@ function renderConsoleHtml(registryBase: string): string {
 <!-- 主應用 -->
 <div id="shell">
   <div id="sidenav">
-    <div class="logo">Mira</div>
+    <div class="logo">${brand}</div>
     <div class="nav" data-nav="cockpit">駕駛艙</div>
     <div class="nav" data-nav="search">總庫搜尋</div>
     <div class="nav" data-nav="workflows">工作流</div>
@@ -343,7 +343,7 @@ function renderConsoleHtml(registryBase: string): string {
 
   <!-- 駕駛艙 -->
   <div class="view page" id="v-cockpit">
-    <div class="pagehead"><span class="t">Mira<span style="font-size:14px;letter-spacing:.3em;color:rgba(var(--ink-rgb),.5)">　控制台</span></span><span class="m serif" id="ck-date"></span></div>
+    <div class="pagehead"><span class="t">${brand}<span style="font-size:14px;letter-spacing:.3em;color:rgba(var(--ink-rgb),.5)">　控制台</span></span><span class="m serif" id="ck-date"></span></div>
     <div class="cockgrid">
       <div>
         <div class="orb-row">
@@ -1475,5 +1475,6 @@ consoleRouter.get('/console', (c) => {
   const registryBase = subdomain
     ? `https://arcrun-registry.${subdomain}.workers.dev`
     : 'https://registry.arcrun.dev';
-  return c.html(renderConsoleHtml(registryBase));
+  // 品牌字樣（Arcrun#21）：引擎預設 Arcrun，實例可用 CONSOLE_BRAND 覆蓋（如 "Arcrun RAG"）
+  return c.html(renderConsoleHtml(registryBase, c.env.CONSOLE_BRAND || 'Arcrun'));
 });
diff --git a/cypher-executor/src/types.ts b/cypher-executor/src/types.ts
index 53ec757..7e59ac3 100644
--- a/cypher-executor/src/types.ts
+++ b/cypher-executor/src/types.ts
@@ -78,6 +78,10 @@ export type Bindings = {
   // console 登入後端一律用這個字串打 /kbdb/*、/workflows/search（不做多租戶，登入系統只擋外人看頁面）。
   // 未設 → routes/console-auth.ts 預設 "leo"（發現①已核實：D1 458,357 筆資料實際使用的租戶字串）。
   CONSOLE_TENANT?: string;
+  // Console 顯示品牌／實例名（Arcrun#21 rebrand，非機密）。只影響 UI 字樣（title/header/logo），
+  // 不影響任何行為。未設 → "Arcrun"（console 是引擎共用件，不寫死產品名）。
+  // 實例可覆蓋，例：arcrun-rag demo 可設 --var CONSOLE_BRAND:"Arcrun RAG"。
+  CONSOLE_BRAND?: string;
   // ── console 駕駛艙「等你的事」活資料源（fix/console-dashboard-live-data，2026-07-07）──
   // 等 leo 的事真相源＝InkStoneCo sprint 檔「## 等 leo 清單」（progress-guard 每日維護），
   // 不是沒人維護的 KBDB dash_wait。cypher 進程內 fetch Gitea API（自架 Gitea，非 GitHub，
