A good solution to the problem of the first four letters is to spell it as Kanthea. It's still similar, it sounds no less beautiful (in fact, I think it sounds more beautiful) and it doesn't look like it contains bad words.
I was just reading the newspaper and there is a girl (about 13 or 14) named Kunthea. The Thea part is nice but all I see is the first 4 letters (replace the k with a c). I feel sorry for anyone with this name. At least she could go by Thea I suppose.