4 occurrences in 4 dictionaries
Reference: Methusael
Easton
champion of El; man of God, a descendant of Cain (Ge 4:18), so called, perhaps, to denote that even among the descendants of Cain God had not left himself without a witness.
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Fausets
Son of Mehujael in Cain's line, and Lamech's father (Ge 4:18).
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Smith
Methu'sael
(man of God), the son of Mehujael, fourth in descent from Cain, and father of Lamech.