|Int. Standard Bible Encyclopedia|
me-thu'-sha-el (methusha'el): A descendant of Cain, and father of Lamech in the Cainite genealogy (Genesis 4:18). The meaning of the name is doubtful. Dillmann suggested "suppliant or man of God."
Methushael (1 Occurrence)
Genesis 4:18 To Enoch was born Irad. Irad became the father of Mehujael. Mehujael became the father of Methushael. Methushael became the father of Lamech. (WEB JPS ASV BBE DBY NAS NIV)