Genesis 4:18 - Ellicott's Commentary On The Whole Bible

Unto Enoch was born Irad. — Cain was building a city, ‘Ir, and it was this probably which suggested the name ‘Irad. It has little in common with Jared, as it begins with a harsh guttural, usually omitted in English because unpronounceable, but which appears as g in Gomorrah. Possibly ‘Irad means citizen; but these names have been so corrupted by transcribers that we cannot feel sure of them. Thus, here the LXX. calls ‘Irad Gaïdad, and the Syriac ‘Idor. In the list that follows, the names Mehujael (Samaritan Michel, Syriac Mahvoyel), Methusael, Enoch, and Lamech (Heb., Lemech), have a certain degree of similitude with those in the line of the Sethites, whence many commentators have assumed that the two lists are variations of the same original record. But it is usually a similarity of sound only with a diversity of meaning. Thus Mehujael, smitten of God, answers to Mahalaleel, glory to God; Methusael, God’s hero, to Methuselah, the armed warrior. Even when the names are the same, their history is often most diverse. Thus in the Cainite line Enoch is initiation into city life, in the Sethite into a life of holiness; and the Cainite polygamist Lemech, rejoicing in the weapons invented by his son, is the very opposite of the Sethite Lemech, who calls his son Noah, quiet, rest