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The boy's and girl's name Sidney \s(i)-dney, sid-ney\ is pronounced SID-nee. It is of Old English origin, and its meaning is "wide meadow". Also possibly derived from the Norman French place name Saint Denis. First used as a given name in the 18th century, and popular in the 19th century. See also Sydney. Sidney has 5 variant forms: Siddeny, Sideny, Sidneigh, Sidni and Sidnie. Baby names that sound like Sidney are Cidney and Sidnee. Sidney is a popular female first name and a very popular surname (source: 1990 U.S. Census). Displayed below is the baby name popularity trend for the girl's name Sidney. Click here to compare Sidney with related baby names.
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