Sonnie \s(on)-nie\ as a girl's name (also used as boy's name Sonnie), is a variant of Sonia (English) and Sophia (Greek), and the meaning of Sonnie is "wisdom".

The baby name Sonnie sounds like Sannie, Sinnie, Sonni and Sunnie. Other similar baby names are Bonnie, Connie, Donnie, Nonnie, Jonnie, Lonnie, Ronnie and Vonnie.