Supplanter
A modern creative spelling of Jameson, which literally means 'son of James'. The root name James is derived from the Hebrew name Jacob, referring to one who follows or supplants.
Less common today
Jamesyn isn't in the latest US Top 1000. It last peaked at #4,937 in 2019.
US births per 5-year period, 1990βpresent (SSA data).