Likely a blend of Marvin and Mavis
Marvis is a modern American invention, most likely created by combining the masculine Marvin with the feminine Mavis. While it lacks a singular ancient root, it carries the stylistic weight of mid-century names. It is occasionally associated with the Latin word for 'marvelous,' though this is a folk etymology.
Less common today
Marvis isn't in the latest US Top 1000. It last peaked at #4,277 in 1991.
American heavyweight boxer and son of Joe Frazier
Professional basketball player
US births per 5-year period, 1990βpresent (SSA data).