Supplanter
A modern American spelling variant of Jacqueline, which is the French feminine form of Jacques. It ultimately derives from the Hebrew name Jacob, referring to one who follows or replaces another.
Less common today
Jacquilyn isn't in the latest US Top 1000. It last peaked at #4,683 in 1991.
US births per 5-year period, 1990βpresent (SSA data).