Genesis 5:21

“And Enoch lived sixty and five years, and begat Methuselah.] Here the Septuagint version adds again an hundred years; and that Enoch had a son, whose name was Methuselah, is affirmed by Eupolemus f338, an Heathen writer; and Enoch being a prophet gave him this name under a spirit of prophecy, foretelling by it when the flood should be; for his name, according to Bochart f339, signifies, “when he dies there shall be an emission”, or sending forth of waters upon the earth, to destroy it,”

“Enoch . . . begat Methuselah--This name signifies, "He dieth, and the sending forth," so that Enoch gave it as prophetical of the flood. It is computed that Methuselah died in the year of that catastrophe.”

“- Section V - The Line to Noah - The Line of Sheth 1. ספר sepher “writing, a writing, a book.” 9. קינן qēynān, Qenan, “possessor, or spearsman.” 12. מהללאל mahelal'ēl, Mahalalel, “praise of ‘El.” 15. ירד yerĕd, Jered, “going down.” 21. מתוּשׁלה metûshālach, Methushelach, “man of the missile.” 29. נה noach, Noach, “rest,” נחם nācham “sigh; repent; pity; comfort oneself; be revenged.” 32. שׁם shēm, Shem, “name, fame; related: be high.” חם chām Cham, “hot.” יפת yāpet, Japheth, “spreading; related: spread out.” We now enter upon the third of the larger documents contained in Genesis. The first is a diary, the second is a history, the third a genealogy. The first employs the name אלהים…”

“am 687, bc 3317 Methuselah: Gr. Mathusala, Luk 3:37 Genesis 5:22”