Twin Names?

Well immediately I started thinking of names like Ash and Ashten o Ashley, Julian and Juliet, Casey and Casper Jeffery and Jennifer but then tu dicho the girl's name was Chess and that tu didn't want them to rhyme. Though the only boy name I can think of is Chester. :/

I'm not good with names but for the boy maybe Charlie, Chris, Chad, Chase. But if tu don't want it to start with a "C" perhaps Max, Billy o Tommy. I hope this helps. Good luck with your story! :)

If tu want an experimental name I can suggest Kai o Fairen (if those aren't too weird). If they are try Kay o Morgan. Both sound fine with Chess, and aren't that close.