The name Bronx is a boy's name . Bronx and is often added to lists like American Baby Names and discussed in our forums with posts like "A brother or sister for little Jack or Olivia".
From the experts:
Rockers Ashlee Simpson and Pete Wentz put a new baby name on the map when they chose this downscale New York borough name for their son. The Bronx, the place, was named for early Dutch settler Jonas Bronck. Might Bronx become the next Brooklyn? We'd be surprised if it did.