Spellings

Sydney or Sidney?

In the US in 2025, 77% of babies in this name family were spelled Sydney and 22% Sidney. Same name, slightly different impression: here are the figures for each spelling.

Sydney77% of the family873 born in 2025#348 among girls−67% since 2015Sidney22% of the family251 born in 2025#1,323 among boys−19% since 2015Sydnee1% of the family14 born in 2025#7,491 among girls−85% since 2015

Ten years ago

Sydney already led in 2015, with 91% of the family's births; it has 85% in 2025. All spellings together, the family went from 2,936 to 1,033 births (−65%).

Births by spelling, 2015 and 2025
Spelling20152025Change
Sydney2,660873−67%
Sidney180146−19%
Sydnee9614−85%

How they sound

All of these spellings are said the same way: /ˈsɪdni/ (SID-nee). So the choice is about how it looks: it is the spelling people will read on a birth card, a name tag or an email address, and the one your child will sometimes spell out.

In France

In France in 2025: Sydney 20 births and Sidney 10 births. The other spellings are not given there often enough to be counted.

Sources: Social Security Administration (SSA), Insee (France), 2025 data. How we calculate these figures.

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