Crumb is a surname.
Those bearing it include:
George Crumb, composer
David Crumb, composer son of George Crumb
Ann Crumb, actress daughter of George Crumb
Jason Crumb, Canadian football player
Mike Crumb, Canadian football player
Robert Crumb, underground comic artist
Charles Crumb, elder brother of Robert Crumb
Maxon Crumb, younger brother of Robert Crumb
Aline Kominsky-Crumb, wife of Robert Crumb
Sophie Crumb, daughter of Robert Crumb