The name Sidney is a girl's name of French, English origin meaning "Saint Denis".

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While Sidney in this spelling has a long history as a girls' name, it fell off the Top 1000 from the early 50s until 1990. Then it reemerged as one of the newly chic androgynous names for girls, rising into the Top 300 before falling off the Top 1000 list again in 2016. Sydney is now the more fashionable form.

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Sydney

The name Sidney is a boy's name of French, English origin meaning "Saint Denis".

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A contraction name, Sidney comes from Saint Denis and is related to Dioynsius, the Greek god of fertility and wine, although another theory is that it derived from an Anglo-Saxon place name, meaning 'at the wide island.' Sidney is an aristocratic British surname--as in the Elizabethan poet George Sidney-- and later attained a further measure of distinction through its association with the self-sacrificing hero of Dickens's A Tale of Two Cities, Sidney Carton, and with Oscar-winning actor Sidney Poitier. 
 In the US, Sidney was most popular in the 19-teens, when it was in the Top 100 for that decade, but has gradually declined, especially after the girl's name Sydney burst into popularity in the 1990's.

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