Supplanter or one who follows
Jamyah is a modern American creation, likely blending the traditional name Jamie or James with the popular '-yah' suffix. It carries the etymological weight of the name Jacob, suggesting one who follows or replaces.
Less common today
Jamyah isn't in the latest US Top 1000. It last peaked at #2,233 in 2010.
US births per 5-year period, 1990βpresent (SSA data).