Is Merrin a real name or a melodic invention? Singer Bo Bice brought this merry name to the public's attention when he chose it for his daughter, but most reliable baby name sources don't list it. But there is a Cornish saint's name Merryn, thought to be a variation of the Irish names for girls Mirin and Mirren, and so we're going to call Merrin another twist on that ancient group of names.