Custodi are also no more. So, it's only [TBH] for Corsairs these days. For Outcasts, it's mostly IRMM~ and *MR.
I wouldn't worry too much. You can easily identify capital ships by prefixes Groshyr gave you.
As for snubs, it's just like you said, a Hispanic (or generally Mediterranean)-sounding name is a dead giveaway. It's not that hard to identify Corsairs or Outcasts by their character name, so people can definitely do that if they seek to join or avoid their company.
Though, to be sure, you could always give your character a Greek name, since Crete is home to people of Greek ancestry. IIRC, the late Custodi were heavily influenced by Greek culture.
There are also many people of Italian ancestry among Outcasts, but same might go for Liberty, so it's a bit more difficult here
