tólf
From Proto-Germanic *twalif. Compare Old Saxon twēlif, Old English twelf, Old Frisian twelif, Old High German zwelif, Gothic 𐍄𐍅𐌰𐌻𐌹𐍆 (twalif).
From Old Norse tólf, from Proto-Germanic *twalif. Compare Faroese tólv, Norwegian, Swedish, and Danish tolv.