Son of the gray-haired one
A modern spelling variant of the English surname Grayson. It originally denoted the son of a 'gray' or 'reeve' (a local official), often referring to the hair color or status of the father.
Less common today
Graeson isn't in the latest US Top 1000. It last peaked at #2,470 in 2011.
US births per 5-year period, 1990βpresent (SSA data).