Sianna \sia(n)-na\ as a girl's name is a variant of Shawna (English) and Sian (Welsh). See for meaning of Sianna.

The baby name Sianna sounds like Cianna, Sanna, Seanna, Shanna, Siana, Shianna, Sienna and Tianna. Other similar baby names are Lianna, Dianna, Gianna, Jianna, Kianna, Rianna and Vianna.