Anybody?

 X is Latin for ____ , and also Greek for “I give what is due“. It is, moreover, the Latin rendering of Ancient Greek Outis , the pseudonym Odysseus employed to outwit the Cyclops Polyphemus.
X was the name of a few other fictional characters-

A seafaring Indian Prince

A Fish

The protagonist of the movie “ Mr. ____”, thus making his name ___ ___.

What is X?