Sinny \s(in)-ny\ as a girl's name is a variant of Cynthia (Greek), and the meaning of Sinny is "from Mount Kynthos".

The baby name Sinny sounds like Cinny, Sanny, Signy and Sunny. Other similar baby names are Vinny, Binny, Sindy, Dinny, Ginny, Jinny, Winny and Minny.