Jannessa \j(an)-nessa, jann(es)-sa\ as a girl's name is a variant of Janessa (American). See for meaning of Jannessa. The baby name Jannessa sounds like Jennessa, Janeesa, Janissa, Janesse, Janessia, Janess, Jenessa, Jinessa and Jonessa. Other similar baby names are Vannessa, Danessa, Jalessa, Jancess, Lanessa, Ranessa, Vanessa, Vonnessa, Vennessa, Vannesa and Vaniessa.