Depends on the last name......Dominick McSweeny doesn't sound as good as Dylan McSweeny just as Dominic Badabing sounds much better than Dalton Badabing.
This is a cool tool. It shows the popularity of a name over a hundred years or so. Apparently Darcy was used on boys from the 1940's to the 1970's, though not very often. After the seventies, it's been used mainly for girls.