Supplanter
A diminutive form of James, which is derived from the Hebrew name Jacob. It carries the traditional meaning of one who follows or replaces another. While historically used as a nickname, it occasionally stands alone as a rare unisex given name.
Less common today
Jammie isn't in the latest US Top 1000. It last peaked at #2,086 in 1990.
US births per 5-year period, 1990βpresent (SSA data).
Notable figure in early digital copyright legal cases