Genesis 4:19

"And Lamech took unto him two wives: the name of the one was Adah, and the name of the other Zillah."

The purpose of the writer of Genesis is clear, namely, that of recounting the beginnings of various things concerning mankind. The origin of sin in the Fall was given in Genesis 3. Here is the beginning of sacrifice, of the sinful changing of it, of the first murder, of the building of cities, of polygomy and especially the origin of that depraved section of mankind that precipitated the Flood by their wickedness. Lamech was the first polygamist, thus breaking the original intent of God.

Adah means pleasure[24]; Keil gave the meaning of "Adah" as "the adorned," and the name of "Zillah" as meaning "the shady" or the "tinkling" (bell).[25] Several commentators have suggested that the very names of these wives suggest that they were chosen for sensual or lustful reasons. In any case, a great harm came to humanity as a result of Lamech's bad example.