Like bbj said, theres no focus in it. I'd use something like this:
Code:
/target [target=Zàk, nodead, help, exists]; [target=zák, nodead, help, exists];
 [target=zâk, nodead, help, exists]; [target=zãk, nodead, help, exists];
[target=zäk, nodead, help, exists]; [target=Zàk, exists]
/focus target
/cast [target=focustarget] Moonfire