Question on the mutations ...gymryd neges .....cymryd neges....Does this mean one of these is a male taking the message and the other a female?
No, at least I can't think of a situation where that would make a difference. The phase here doesn't have any reason to mutate, but you would use "gymryd neges" is you wanted to say "Can I take a message?" (Alla i gymryd neges?).