Mannix \m(an)-nix\ as a boy's name is of Irish and Gaelic origin, and the meaning of Mannix is "little monk". Anglicized version of Munchin or Mainchin.

Similar baby names are Lennox, Maddox, Madox, Manus, Manzo, Marx, Max, Maxx, Maxie, Phenix and Fenix.