I agree with Seda.
I really like the name
Thomas with the nn
Tommy, but even if my son was a twin, I don't think I could use it because I think it's an insubstantial meaning.
I actually read something, and I don't know how acurate it is, but it said that in Biblical times
Thomas wasn't actually a name. It was just a nickname for a twin, just calling your sister "Sis" or your brother "bro" or a man's son "
Junior", or, as it was, your twin "
Thomas". Ever since I read that,
Thomas has lost it's appeal.