jew's-harp definition by Webster's New World
Origin: earlier Jew's trump, altered (by associated, association with Jew) ; from Dutch jeugdtromp, child's trumpet ; from jeugd, youth (confused in Eng with Middle English Judeu, Jew) plush tromp, trumpet ; from Old French trompe: see trump
jew's-harp definition by American Heritage Dictionary
or jew's harpnoun
Origin: Origin unknown.