Supplanter
A modern diminutive or variant of James or Jamie, ultimately derived from the Hebrew name Jacob. It carries the traditional meaning of one who follows or replaces another.
Less common today
Jamy isn't in the latest US Top 1000. It last peaked at #4,514 in 1990.
Professional magician and skeptic
US births per 5-year period, 1990βpresent (SSA data).