Re: it's better than being named after tuna ...
But is it a Maori *name* as opposed to a word? "Fire" is an English *word* but not a *name*. I'm guessing all or most cultures make at least some distinction between words and names. If Maoris regularly do use their word for fire as a name, then I guess, no there isn't much of a problem. But if they don't, aside from one or two painfully eccentric ones, then yes, they probably would, as a group, not think calling out their word for fire was a great idea; upon hearing it shouted, they might well react like an English speaker would upon hearing "fire" shouted.
Again, I don't know if Ahi is actually used by Maoris as a name.
Before you criticize a man, walk a mile in his shoes. That way, when you criticize him, you're a mile away and you have his shoes!
Steve Martin