Genesis 4:18

"And unto Enoch was born Irad: and Irad begat Mehujael; and Mahujael begat Methushael; and Methushael begat Lamech."

The similarity of some of the names in this genealogy to some of those in the genealogy of Seth is used as an excuse for some to claim that these are actually garbled accounts of the same genealogies, but there is no evidence whatever to support such a view. The very variations in the names used demonstrates their belonging to separate lines. Besides, as Willis expressed it, "The names are similar because people are fond of repeating names of important ancestors."[23] Abraham had a brother and a grandfather named Nahor; there were two Judas' among the Twelve, two Simons among the Twelve; and in the genealogy of Christ one finds such names as Amos, Nahum, Judas, Jesus, two Matthats, Eleazer, and a number of others that may easily be identified with persons outside of Jesus' ancestry. There are so many Marys in the Bible that sometimes it is difficult to determine who is meant! (See further note at the end of the chapter on the reasons why these two genealogies cannot be the same.)