I always thought moel meant breast. The mountain Moelwyn Mawr means large white breast. Its a bit like the scottish hill of a very familiar shape called the Pap of Glencoe - a friend of mine always wanted to go up and fondle the summit cairn. If I'm wrong, please don't tell me - it'll spoil my dreams and fantasies, and I'll never be able to look at certain mountains in the same way again.

Cheers
Ray