I adore the name
Maureen. Then again, it's my niece's name (
Maureen Elizabeth, nn
Mo) so I'm biased. We called her Momo as a child, but she didn't like that very much.
She's 21 now, and I'm told there are several little Maureens in the Catholic school system in their town right now -- her mother is a teacher so I have inside info. I don't know if it will be catching on nation-wide, but I'm happy there's at least a pocket where it seems to be surviving well.
I love
Mairin too, although I would be torn between pronouncing is the same as
Maureen or as "MOY-reen."