Gen:4:22: And Zillah, she also bare Tubal-cain, an instructer of
every artificer in brass and iron: and the sister of Tubal-cain was
Naamah.
Tubal-Cain is a descendant of Adam and Eve through Cain.
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(Genesis 4:17-22) Tubal-cain was the eighth generation after
Cain and "the forger of every sort of tool of copper and iron."
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Genesis 4:22
New King James Version (NKJV)
22 And as for Zillah, she also bore Tubal-Cain, an instructor of every craftsman in bronze and iron. And the sister of Tubal-Cain was Naamah.
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There is only one but a descendant was named Tubal-Cain an instructor of every craftsman in bronze and iron. And the sister of Tubal-Cain was Naamah (Genesis 4:22).