Ah, didn't think of looking in GM. I just use Cysgeir these days ... but I should be more thorough. Some nouns are 'officially' one gender but dialectically swing another way. It's late-ish so I won't try to get clever with that thought. It's very rarely a deal-breaker, although in spoken Welsh the word for 'man' and 'ass' (as in your bum) can sound alike and the wrong mutations can make for some misunderstanding ...

There are lots of 'wrong' mutations and gender assignment in Welsh folk songs, particularly if you look at original manuscripts. Life is too short to a) get your knickers too twisted about this and b) dust.

(Actually, Bannau Brycheiniog wouldn't mutate cuz theyz plural and plurals don't mutate after 'the' - although they do mutuate after, possesive articles. Again, lose no sleep over this.)

sian