George Crabbe, a famous British poet and naturalist

Nicholas Crabbe is a character in an eponym novel by Frederick Rolfe

Buster Crabbe, a famous athlete and movie serials actor (he made Flash Gordon)

Lionel Crabb, a Royal Navy Frogman, became (in)famous after an incident allegedly involving espionage and resulting in his disappearance.

Jeremiah Crabb, a United States General during the Whiskey Rebellion and representative from Maryland.