Son of the stone worker
Maesyn is a modern creative spelling of the surname Mason. It originates from the occupational name for someone who worked with stone, derived from the Old French 'masson'.
Less common today
Maesyn isn't in the latest US Top 1000. It last peaked at #4,130 in 2018.
US births per 5-year period, 1990βpresent (SSA data).