So far it's only been Codsworth, though
the Fallout Wikia has a handy list of all the names Codsworth will audibly articulate.Some of them are quite juvenile.
Katniss and
Kal-El are some other fun pop-culture names he will say, along with
Prince,
Tallahassee for you Zombieland fans,
Venkman,
Wanderer in case you liked Fallout 3's Lone Wanderer, and
Doctor/Mr. Freeman (he can recognize a title and will simply skip to the actual name parts). That's right. You can finally make a Gordon Freeman who can SPEAK (Half Life 3 confirmed?).
In total there are about 930 names he is known to speak so far, which includes memorable names like "Boobies" and "Fuckface".
It's really fun to play around with.