Genesis 4:17-18 YLT

17 and Cain knoweth his wife, and she conceiveth, and beareth Enoch; and he is building a city, and he calleth the name of the city, according to the name of his son -- Enoch.
18 And born to Enoch is Irad; and Irad hath begotten Mehujael; and Mehujael hath begotten Methusael; and Methusael hath begotten Lamech.