apparently from H2986 (compare H2981) and H7014; offspring of Cain; Tubal-Kajin, an antidiluvian patriarch; Tubal-cain.
Usages throughout the bible
Genesis 4:22
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And Zillah, she also bare Tubalcain, H8423 an instructer of every artificer in brass and iron: and the sister of Tubalcain H8423was Naamah.