How would you pronounce it, Thee-uh or Tay-uh?
[name_f]Thea[/name_f] is pronounced Thee-uh.
People could probably get used to a [name_u]Tay[/name_u]-ah pronunciation (sort of like [name_f]Theresa[/name_f]), but with that spelling most will assume Thee-a.
Sounds pretty but the spelling is a problem. [name_f]Tea[/name_f] is how the actress [name_f]Tea[/name_f] [name_u]Leoni[/name_u] ([name_u]Tay[/name_u]-uh) spells her name.