Casey vs Sidney
Comparing Casey and Sidney? Both are popular picks for parents in 2026. Casey ranks in the Top 1000 tier and traces to Irish naming roots (meaning "Vigilant, watchful"). Sidney sits in the Top 1000 tier with English origins (meaning "From the wide island").
Casey
- Meaning: Vigilant, watchful
- Origin: Irish
- Popularity (2026): Top 1000
- Full Casey name page
Sidney
- Meaning: From the wide island
- Origin: English
- Popularity (2026): Top 1000
- Full Sidney name page
Which name is more popular: Casey or Sidney?
In our 2026 popularity tracker, Casey ranks higher (Top 1000) than Sidney (Top 1000).