Namesakes
Fictional Characters from Movies:
1 character
Harry Callahan 1971 Dirty Harry 
Notable Athletes:
1 football
(football) Bryce Callahan 1991-
Title Characters:
1 film/song, 1 song
(film/song) Harry Callahan 1971; 2005 Dirty Harry
(song) Danny Callahan 2008 Danny Callahan