תּוּבַל קַיִן Tûwbal Qayin (H8423)

Tubal-Kajin, an antidiluvian patriarch

Tubal-cain = "thou will be brought of Cain" 1) son of Lamech by his wife Zillah and the first worker in metal

apparently from יָבַל (H2986) (compare יְבוּל (H2981)) and קַיִן (H7014); offspring of Cain;