Supplanter
A rare spelling variant of Jacob, derived from the Hebrew name Yaakov. It traditionally refers to the biblical patriarch born holding his twin brother's heel, symbolizing one who follows or replaces.
Less common today
Jackob isn't in the latest US Top 1000. It last peaked at #6,712 in 2000.
US births per 5-year period, 1990βpresent (SSA data).