Son of the steward or son of the gray-haired one
A modern spelling variant of the English surname Grayson. It traditionally denotes the son of a 'reeve' (a medieval official or steward) or simply the son of a man with gray hair.
Less common today
Graysin isn't in the latest US Top 1000. It last peaked at #5,919 in 2013.
US births per 5-year period, 1990βpresent (SSA data).