In my games...well...if it is aliens that are born to human male via alien abduction they just get a human/english mostly names as it is the human parent that raises them. Babies born between a human and an alien get human/english names as well names (so far), especially if said aliens have HUMAN names. In my game, non born-in-game aliens in households are all townie scooped and they both carry ordinary human/english names.
My aliens are usually aliens trying to blend in with the human population for ...reasons. They might go out of their disguises once in a while and a select humans know that they are aliens but all in all they are living as humans doing everyday human things. If your aliens want to blend in, I'd just choose human names but as us humans do at times tend to choose unusal names for our offsprings; choosing something off the wall names wouldn't be bad either imo.