1) Anglicised Irish surname 2) Eastwood role 3) English boy name 
Type: Term Pronunciation: kal′ă-han Definitions: 1. John R., U.S. endodontist, 1853-1918. See: Callahan method
Callahan is an English name for boys and girls. The meaning is `battle` The name Callahan is most commonly given to American boys. In Scotland it is (almost) solely given to boys What do they use in other countries? Callaghan See also: Ceallagh, Ceallach