From Middle English clepen, clepien, from Old English cleopian, clipian (“to speak, cry out, call, summon, invoke, cry to, implore”), from Proto-Germanic *klipōną (“to ring, sound”), from Proto-Indo-European *gal- (“to sound”). Cognate with Old Frisian klippa, kleppa (“to ring”), Dutch kleppen (“to toll, chatter”), Middle Low German kleppen (“to strike, sound”), Middle Low German kleperen (“to rattle”).