I'm terrible at naming other people's fish but he's sure cute! Be careful with those decorations though, I just don't want him to snag his fins and rip them! Usually plastic plants aren't great for Betta's because they will rip the fins which can sometimes lead to infections. Same thing with decorations. The old trick is to, before you put them in, is to run pantyhose over them and if it snags, then it will also snag your Betta's delicate fins :) Silk plants are good however!
Hmmm he kind of looks like a Rambo, Tiger, Azure, Magenta, Carmine, Crimson, or Raspberry? Sorry, just spitting names XD