Supplanter or replacement
Jamien is a modern elaboration of the name James, which ultimately derives from the Hebrew name Jacob. It follows the contemporary trend of adding an '-en' suffix to traditional roots to create a familiar yet distinct sound.
Less common today
Jamien isn't in the latest US Top 1000. It last peaked at #4,097 in 2008.
US births per 5-year period, 1990βpresent (SSA data).