Sidney

Meaning and origin

Sidney means “wide island” through an English surname. The surname came from English place names built from the Old English words sid, meaning “wide,” and ieg, meaning “island.” Another proposed explanation connects it with Saint-Denis in Normandy, although that route has less support.

The surname became a given name in honor of Algernon Sidney, the seventeenth-century politician who was executed in 1683. The poet and statesman Philip Sidney, who lived from 1554 to 1586, is another important bearer of the family name. Those associations connect Sidney’s first-name history with English political and literary life.

Sidney has traditionally been more common for boys, but it also has an established history for girls. In the United States, girls named Sidney outnumbered boys with the spelling from 1993 through 2019, following the growing popularity of Sydney for girls.

Pronunciation and related forms

Sidney is pronounced SID-nee, with two syllables and the stress on the first. Sid is an established familiar form. Sydney is a closely related spelling, and Sidnei is used in Brazilian Portuguese.

The two English spellings usually sound alike, so their distinction is most apparent in writing. Sidney keeps the i in its first syllable, while Sydney uses a y. Both belong to the same surname family, with separate popularity records when used as given names.

Sidney Poitier

Actor Sidney Poitier gives the name an important place in film history. His performance in The Defiant Ones, released in 1958, earned his first Academy Award nomination. He later won Best Actor for Lilies of the Field, a 1963 film, becoming the first Black performer to win that category at the 1964 ceremony.

Poitier’s other films included A Patch of Blue in 1965 and both In the Heat of the Night and Guess Who’s Coming to Dinner in 1967. He also worked as a director. Born in Miami and raised in the Bahamas and the United States, he became one of the most recognizable bearers of Sidney as a first name.

Popularity in the United States

Sidney’s strongest historical period for American boys came in the early twentieth century. Its best rank was number 80 in 1912, and its largest annual count was 1,879 boys in 1918. It ranked number 1,327 for boys in 2025.

For girls, Sidney’s best rank was number 258 in 1999, followed by its largest annual count of 1,221 in 2000. It ranked number 1,878 for girls in 2025. The separate peaks show how the same spelling has belonged to different naming generations for boys and girls.

How popular is Sidney?

In 2025, Sidney ranked #1,327 among boys in the United States, with 146 recorded uses. The U.S. birth records first list this spelling for boys in 1880; its largest annual count was 1,879 in 1918. Rankings count each spelling separately. They describe national use, so local familiarity can differ. The popularity chart shows whether the name has remained common, returned after a quieter period, or risen recently.