After Cain slew Able, he eventually hooked on some old gal. Neanderthal?
Able? Abel. Cain was a cannibal, ate Abel, retorted "am I my brother's keeper? (burp!), got branded, then went off and shacked up with some unexplained woman from the Land of Nod. That's where humanity picked up sleep apnea.
Lilith?
Adam's first wife?