Definition (full): Cain -- a city in southern Judah
Strong's Exhaustive Concordance
The same as qayin (with a play upon the affinity to qanah); Kajin, the name of the first child, also of a place in Palestine, and of an Oriental tribe -- Cain, Kenite(-s).
KJV: And Adam knew Eve his wife; and she conceived, and bare Cain, and said, I have gotten a man from the LORD.
NASB: Now the man had relations with his wife Eve, and she conceived and gave birth to Cain, and she said, "I have gotten a manchild with the help of the LORD."