Brettnie \b-rett-nie, br(et)-tnie\ as a girl's name is a variant of Brittany (Latin), and the meaning of Brettnie is "from Brittany or Great Britain".

The baby name Brettnie sounds like Brittnee, Bryttnee, Brittni, Brittne, Brittenie and Brettney. Other similar baby names are Brenie, Brette and Brittie.