Sidney \s(i)-dney, sid-ney\ as a boy's name (also used as girl's name Sidney), is pronounced SID-nee. It is of Old English origin, and the meaning of Sidney is "wide meadow". Also possibly from the Norman French place name Saint Denis. Used as given name in the 18th century and popular in the 19th. Sidney is favored for boys; Sydney is almost entirely used for girls. See also Cydney. Author Sidney Sheldon; film director Sydney Pollack; actor Sidney Poiter.

Sidney has 3 variant forms: Sid, Syd and Sydney.

Baby names that sound like Sidney are Stoney, Sidonio and Stone.