Tomas- are you pronouncing it like Thomas and just dropping the H so you'll have a "different" spelling? I've known people named Tomas, but they were all Spanish/ Hispanic and pronounced it toe-MAHS.

I like Isaac or Isak, not so much spelled Izack.
Bub would probably get tom or tommy 99% of the time so that's why we were thinking about that spelling not so much trying to be different but I do like how it looks as well.