Collin

As with the more common one-L spelling, Collin with two L's has Gaelic roots and means “cub, young one.” But it’s also considered a medieval form of Col, which is taken from the name Nicholas. While Colin has widespread popularity in Britain, the double-L version is a hit in the US. Still, its most famous namesakes use the single-L version—here’s looking at you, actors Colin Farrell, Firth and Hanks.