Spear-son or son of Gerard
Garison is an English patronymic surname meaning 'son of Gary' or 'son of Gerard'. The root name Gary is derived from the Germanic element 'ger', meaning spear, while Gerard combines it with 'hard', meaning brave or hardy.
Less common today
Garison isn't in the latest US Top 1000. It last peaked at #6,542 in 1997.
US births per 5-year period, 1990βpresent (SSA data).