Geek alert, here.
I'm obviously partial to Lord of the Rings since I named by chocolate halfmoon Radagast from one of the wizard's names, Radagast the Brown.
So a perfect name for a white, iridescent betta for me would have to be Saruman. He was Saruman the White, but his white robes were described as constantly changing swirls of color. Sounds just like your boy to me!
--Chris in Pensacola
Fluval Edge 12 Gallon Planted
1 HM Male Betta, 9 Cardinal Tetras, 3 False Julii Corys, 1 Clown Pleco
Golden Apple & Tiger Nerite Snails, Cherry & Amano Shrimp