An Etymological Dictionary of the German Language/sechs

by Friedrich Kluge

sechs, num., ‘six,’ from MidHG. and OHG. sëhs; a common Teut. and primit. Aryan num.; comp. OSax. sehs, Du. zes, AS. and E. six, OIc. sehs, Goth. saíhs; primit. Aryan seks (and sweks). Comp. Sans. šaš, Zend χšvaš, Gr. ἕξ, Lat. sex, W. chwech, OSlov. šestĭ.