Sidni \s(i)-dni, sid-ni\ as a girl's name is a variant of Sidney (Old English), and the meaning of Sidni is "wide meadow".
The baby name Sidni sounds like Sidnie, Sideny, Sidonia, Sidony, Sidonie, Sydnie and Sidnee. Other similar baby names are Sinny, Sinnie, Sina, Sine, Sidra, Siena, Signa, Signy, Signe, Sivnie, Sonni and Sunni.