French, literally "a great heap" (13c.), from beau "fine, great" (see beau (n.)) + coup "a stroke," also "a throw," hence, "a heap" (see coup (n.)). Compare Spanish golpe "multitude," from the same Latin source.
Beatlemania
Beatles
beatnik
Beatrice
beau
beaucoup
Beaufort scale
beau-ideal
Beaujolais
beau-monde
beaut