Oh my goodness! I had a betta named Excalibur a few years ago! I couldn't decide what to name him, but when I glanced at a book of King Arthur stories and saw that he matched the color of the sword, I knew it was meant to be.
He had a gold head, baby blue body, and pearly white fins. He was a beautiful crowntail, and survived sitting on my counter for a day when my cat knocked his tank over. Best fishie ever. Sorry for spilling all over your thread. :/
Your betta is gorgeous! I've always loved yellows. I can't wait to see how he colors up!