Methusael
The name Methusael means “who demands his death”.
Easton's Bible Dictionary 1897
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.
Smith's Bible Dictionary 1863
(man of God), the son of Mehujael, fourth in descent from Cain, and father of Lamech. (Genesis 4:18)
International Standard Bible Encyclopedia 1915
me-thu'-sa-el.
See METHUSHAEL.