Methusael
champion of El; man of God, a descendant of Cain (Gen. 4:18), so
called, perhaps, to denote that even among the descendants of
Cain God had not left himself without a witness.
Bibliography Information Easton, Matthew George. M.A., D.D., "Biblical Meaning for 'Methusael' Eastons Bible Dictionary". bible-history.com - Eastons; 1897.