What was the name of Noah’s grandfather in the Genesis genealogies?

Noah’s grandfather in the Genesis genealogies was Methuselah. Genesis 5 places Methuselah in the line from Adam to Noah: Methuselah was the son of Enoch, the father of Lamech, and the grandfather of Noah.

The same chapter states that Methuselah lived 969 years, the longest lifespan attributed to any person in the Bible. His age has made his name a byword for exceptional old age. Genesis does not connect him directly with building the ark or describe him as a participant in the flood episode.

A common mix-up is confusing Methuselah with his son Lamech, who was Noah’s father, or with Enoch, who was Noah’s great-grandfather. The genealogy gives these relationships in sequence. It also says Methuselah had other sons and daughters, but Noah’s line is the branch followed in the narrative.