diff --git a/addons/mail/static/src/core/thread_model.js b/addons/mail/static/src/core/thread_model.js
index 87ecbf7fe85..0cc15614208 100644
--- a/addons/mail/static/src/core/thread_model.js
+++ b/addons/mail/static/src/core/thread_model.js
@@ -214,9 +214,13 @@ export class Thread {
             );
         }
         if (this.type === "group" && !this.name) {
-            return this.channelMembers
-                .map((channelMember) => channelMember.persona.name)
-                .join(_t(", "));
+            const listFormatter = new Intl.ListFormat(
+                this._store.env.services["user"].lang.replace("_", "-"),
+                { type: "conjunction", style: "long" }
+            );
+            return listFormatter.format(
+                this.channelMembers.map((channelMember) => channelMember.persona.name)
+            );
         }
         return this.name;
     }
diff --git a/addons/mail/static/tests/discuss/channel_invitation_tests.js b/addons/mail/static/tests/discuss/channel_invitation_tests.js
index 522811a87c0..3b96b9f8c8f 100644
--- a/addons/mail/static/tests/discuss/channel_invitation_tests.js
+++ b/addons/mail/static/tests/discuss/channel_invitation_tests.js
@@ -111,6 +111,6 @@ QUnit.test("should be able to create a new group chat from an existing chat", as
     await click("button[title='Create Group Chat']");
     assert.strictEqual(
         $(".o-mail-Discuss-threadName").val(),
-        "Mitchell Admin, TestPartner, TestPartner2"
+        "Mitchell Admin, TestPartner, and TestPartner2"
     );
 });