From Middle English comb, from Old English camb ("comb"), from Proto-West Germanic *kamb, from Proto-Germanic *kambaz ("comb"), from Proto-Indo-European *ǵómbʰos ("tooth"), from Proto-Indo-European *ǵómbʰ- ("to pierce, gnaw through").
Compare Saterland Frisian Koum, Swedish/Dutch kam, Norwegian kam, German Kamm); also Tocharian B keme, Lithuanian žam̃bas ("sharp edge"), Old Church Slavonic зѫбъ, Albanian dhëmb, Ancient Greek γομφίος ("backtooth, molar"), Sanskrit जम्भ).