The name Callen is of Irish origin and means "Slender, Thin." The origin is the culture in which the name originated, or in the case of a word--the language in which it most appears.
From the Gaelic name CAOLĂN.
Callen is on 190 BN name lists Callen is currently not ranked on the BN charts Callen is currently #570 in U.S. births
Callen 
