Common Germanic cognates include Old High German fior (German vier), Old Saxon fiuwar, Old Dutch viuwar (Dutch vier), Old Norse fjórir, Gothic 𐍆𐌹𐌳𐍅𐍉𐍂(fidwōr).
Indo-European cognates include Proto-Slavic *četyre (Russian четыре(četyre)), Old Irish cethair, Greek τέσσαρες(téssares), Latin quattuor.