Thank you! It's a good point, the whole 'ch' sound being repeated. I've asked a few friends about that as I was worried too, but they said our surname would be okay (or maybe they were just being polite?) It's a 'Cha' sound and somehow the 'a' that follows the 'ch' helps soften it? (Am aware I am sounding a bit loony here, analysing letters!)

Would love more honest feedback, so thanks so far and please keep your thoughts coming!