Half of the characters you don't even find out their surnames, so I wouldn't worry about stuff like that. And remember

Quote Originally Posted by The Grand List of Role-Playing game cliche's
7.Some Call Me... Tim?
Good guys will only have first names, and bad guys will only have last names. Any bad guy who only has a first name will become a good guy at some point in the game. Good guys' last names may be mentioned in the manual but they will never be referred to in the story.