Etymology

From Proto-Iranian (compare Persian شش ‎(šeš), Kurdish şeş), from Proto-Indo-Iranian (compare Sanskrit षष् ‎(ṣáṣ)), from Proto-Indo-European *swéḱs (compare Lithuanian šеšì, Tocharian B ṣkas, Latin sex, Old Church Slavonic шєсть ‎(šestĭ), Old English siex (English six)).