Jezebel means a shameless or immoral woman.
Is there a connate or coeval word for a man that would mean the same, as if it was coined to be the male counterpart of Jezebel?
Jezebel was Queen of Israel when Ahab was King. She is written about in 1 Kings. Her name lives in infamy to this day because of her actions, not because the name was coined intentionally with any implied meaning. I know of no male counterparts whose names carry the same connotation, but Adolf and Benedict spring to mind as two examples of male names that are closely associated with the notorious actions of particular individuals.