Supplanter
A modern American elaboration of Jacqueline, which is the French feminine form of Jacques. It ultimately derives from the Hebrew name Jacob, referring to one who follows or takes the place of another.
Less common today
Jacalynn isn't in the latest US Top 1000. It last peaked at #9,534 in 1991.
US births per 5-year period, 1990βpresent (SSA data).