Sydney \s(y)-dney, syd-ney\ as a girl's name (also used as boy's name Sydney), is pronounced SIHD-nee. It is of Old English origin, and the meaning of Sydney is "wide meadow". Also possibly place name: Saint Denis. Sidney is favored as a name for boys, and Sydney is almost entirely used for girls, probably due to influence in the 1980s from madam/celebrity Sydney Biddle Barrows.
Sydney has 9 variant forms: Cydney, Cydnie, Sidnee, Sidney, Sidnie, Sydel, Sydelle, Sydnee and Sydnie.