dc - Is it 'Batmen' or 'Batmans'?

If Batman met a clone of himself or a Batman from an alternate dimension, would we say:

There are two Batmen

or

There are two Batmans

You'd assume Batmen but Batman is his name, not his title.

Have we ever seen any examples in canon?

Answer

This issue of Superman/Batman is called:

Supermen/Batmen

So I'd have to assume that's the correct way to say it.

Grammatically, Batmans might actually be correct since it's his name and not his title, like you say. But Batmans just sounds wrong.