siex
From Proto-Germanic *sehs, whence also Old Frisian sex, Old Saxon sehs, Middle Dutch sesse (Dutch zes), Old High German sehs (German sechs), Old Norse sex (Swedish sex), Gothic 𐍃𐌰𐌹𐌷𐍃 (saihs). Ultimately from Proto-Indo-European *swéḱs, cognate with Ancient Greek ἕξ (héx), Latin sex, Old Irish sē (Irish sé), Proto-Slavic *šestь (Russian шесть (šestʹ)).
