You said AutoHotKey but I'm wondering if you meant HotkeyNet. (I'm not saying you got the names mixed up but lots of people do.)

If you meant HotkeyNet, and if you downloaded one of the sample scripts from the Quick Start page, those scripts contain two hotkeys that use different methods of renaming. There's a hotkey to launch and rename in one step. There's another hotkey to rename your WoWs after you launch them by hand.

http://hotkeynet.com/wow/wow-quick-start.html