[name_f]Thea[/name_f] but it’s super close!
Where I live, most of the Theas I have met pronounce their name “tay-a”, or “thay-a” (but with a very soft th), so that kind of blends the names in a way you might like!
I personally prefer [name_f]Thea[/name_f] (pronounced “thee-a”, or “tay-a”/“thay-a”) to [name_f]Freya[/name_f], but both are lovely!