Lamech was also the father of a daughter, whose name was Naamah.
And Lamech toke hym two wyves: the one was called Ada/ and the other Zilla.
Jerome even forgets that Lamech represented the seventh generation from Adam!
They were those of Lamech's wives: those of Cain and Abel are not called by their names.
All the Old Testament heroes, from Lamech downwards, were polygamists.