Supplanter
A diminutive form of James or Jamie, ultimately derived from the Hebrew name Jacob. It carries the traditional meaning of one who follows or replaces another, though it is now primarily used as a friendly, modern given name.
Less common today
Jaimey isn't in the latest US Top 1000. It last peaked at #8,446 in 1994.
US births per 5-year period, 1990βpresent (SSA data).