Supplanter
A modern creative spelling of Jameson, which literally means 'son of James.' The name James is derived from the Hebrew name Jacob, which refers to one who follows or supplants.
Less common today
Jamyson isn't in the latest US Top 1000. It last peaked at #5,907 in 2020.
US births per 5-year period, 1990βpresent (SSA data).