Genesis 4:22

And Zillah bare also Tuvalkain, the chief (rab) of all artificers who know the workmanship of brass and iron. And the sister of Tuvalkain was Naama; she was mistress of elegies and songs.

FORGER OF EVERY CUTTING INSTRUMENT OF BRASS AND IRON. He was a forger and cutter of all brass and iron. Scripture thus states that he was a forger and cutter in all works of brass and iron. A similar [usage in transposing a word is found in the verse]: Forgive all iniquity, and accept that which is good. In the opinion of Onkelos, however, this is connected with the first verses, meaning he was the father of every forger and cutter in brass and iron.

AND THE SISTER OF TUBAL-CAIN WAS NAAMAH. This is as if Scripture would say: “and a sister was born to him and her name was Naamah.” A similar sense is found in the verses: And Lotan’s sister was Timnah; And Miriam their sister; His sister’s name was Maacah.
In Bereshith Rabbah there are some Rabbis who say that Naamah was Noah’s wife. “And why did they call her Naamah [which means lovely]? Because her deeds were lovely and pleasant.” By this the Rabbis meant to say that she was famous in those generations because she was a righteous woman and she gave birth to righteous children. This was why Scripture mentioned her. If so, a small remembrance of Cain was left in the world. However, if we say that she was not the woman from whom Noah begot his three sons, there is no reason for Scripture mentioning her. However, our Rabbis have another Midrash concerning her which states that she was the very beautiful woman in whom the bnei ha’elohim erred. This is hinted in the verse, And the ‘bnei ha’elohim’ saw the daughters of men,, Verse 2. as mentioned in Pirkei d’Rabbi Eliezer. But other sources have it that Naamah was the wife of Shamdon, the mother of Ashmedai, and it is from her that the demons were born for her name is indeed found in the writings of “the use of the demons.” Scripture hints and deals briefly with such hidden matters.

וצלה גם היא, the word גם relates to the sons of Adah, both of whom had acquired special skills. Tzilah, contrary to her function, to be decorative, also acquired another skill, giving birth to a son or sons. The son mentioned here is mentioned by name because he too excelled in a new skill, becoming a coppersmith. The reason why he was given a dual name, Tuval Kayin, might be that when born he was simply called Tuval. When Kayin died, this name was added to his original name to provide a memorial of sorts to his ancestor Kayin.

לוטש כל חרש נחשת וברזל, sharpener of copper and ironcraft; this description by the Torah, as opposed to the previous introduction of artisans as אבי, “father of, i.e. inventor of or discoverer of, maybe that his predecessors had already worked with these metals and had fashioned tools and vessels out of them. Tuval Kayin’s contribution may have been that he learned how to sharpen these tools so that they did not have to be replaced by new ones all the time. The word לטישה in this sense occurs in Samuel I 13,20. During the period described in Samuel, the Israelites had to travel to the land of the Philistines to have their agricultural tools sharpened, as they were not allowed to have weapons made of metal. The word חרש אבן is found in Exodus 31,6 where it describes the parallel art of working with stone. (compare Samuel I 15,15 and Joshua 8,7 where the word תפש appears in a related manner)

ואחות תובל קין נעמה. The reason the Torah mentions this is to inform us that Tuval Kayin did not have a brother, as opposed to his half-brother יבל, but that the sibling he did have, i.e. a sister, was called נעמה According to Bereshit Rabbah 23,3 this Naamah became the wife of Noach, being the only surviving individual of the offspring of Kayin. She was called נעמה in recognition of her good character. Other scholars in the same Midrash do not agree that the Naamah who became Noach’s wife was the one mentioned here. They attribute the name Naamah here to this woman’s ability to play music on these instruments.