diff --git a/lib/selectors/nav-selectors.js b/lib/selectors/nav-selectors.js
--- a/lib/selectors/nav-selectors.js
+++ b/lib/selectors/nav-selectors.js
@@ -124,15 +124,21 @@
         if (member.id === viewerID) {
           continue;
         }
-        const userInfo = memberMap.get(member.id);
-        if (userInfo?.username) {
-          searchTextArray.push(userInfo.username);
+        const userInfo = userInfos[member.id];
+        const rawUsername = userInfo?.username;
+        if (rawUsername) {
+          searchTextArray.push(rawUsername);
+        }
+        const resolvedUserInfo = memberMap.get(member.id);
+        const username = resolvedUserInfo?.username;
+        if (username && username !== rawUsername) {
+          searchTextArray.push(username);
         }
       }
       searchIndex.addEntry(threadInfo.id, searchTextArray.join(' '));
     }
     return searchIndex;
-  }, [threadInfos, viewerID, memberMap]);
+  }, [threadInfos, viewerID, userInfos, memberMap]);
 }
 
 function useGlobalThreadSearchIndex(): SearchIndex {