Supplanter or one who replaces
Jaymian is a modern invented name, likely created by blending the phonetic elements of Jay and Damian. As a derivative of the name James or Damian, it carries the historical connotation of one who follows or replaces another.
Less common today
Jaymian isn't in the latest US Top 1000. It last peaked at #7,395 in 2015.
US births per 5-year period, 1990βpresent (SSA data).