Albert Barnes Commentary 1 Chronicles 6:20

"Of Gershom: Libni his son, Jahath his son, Zimmah his son," — 1 Chronicles 6:20 (ASV)

Of Gershom - The names in this list are curiously different from those in 1 Chronicles 6:41–43, which nevertheless appear to represent the same line in reverse. Probably both lists are somewhat corrupted and, as is common in many genealogies, names have been omitted to reduce the number to seven. Compare, for example, 1 Chronicles 6:22–28 with 1 Chronicles 6:33–38. Compare the other genealogies in this chapter; see also Matthew 1:1-17.