Supplanter
A creative spelling of the Hebrew name Jacob. It traditionally refers to the biblical patriarch born holding his twin brother's heel, later interpreted as 'one who follows' or 'supplanter'.
Less common today
Jaicob isn't in the latest US Top 1000. It last peaked at #5,971 in 2016.
US births per 5-year period, 1990βpresent (SSA data).