Briannah \bri(an)-nah\ as a girl's name is a variant of Brianna (Irish, Gaelic, Celtic), and the meaning of Briannah is "high, noble, exalted".
The baby name Briannah sounds like Breanna, Brinna, Brennah, Bryanna, Brienna, Brieanna, Briaunna, Briauna, Brianni, Brianne, Briann, Briana, Briahna and Brionna. Other similar baby names are Arianna, Brianda, Briannon and Orianna.