Tilly \t(il)-ly\ as a girl's name is a variant of Matilda (Old German) and Tilda, and the meaning of Tilly is "mighty in battle".

The baby name Tilly sounds like Tilli, Tally, Tilley and Tully. Other similar baby names are Milly, Billy, Cilly, Gilly, Hilly, Jilly, Lilly, Tildy and Willy.