I had a friend in high school who I was doing a playthrough of VII with just so we could catch all of the weird, silly things in the game. I feel like we did this a couple of times and both times we gave the characters silly names just so that it would make for amusing dialogue. I sadly cannot remember them though!

I also like giving Tidus names such as "Boy", "You", and "Him." That way people refer to him by name occasionally.