Spelling Variants
Sidnei vs Sidney: Which Spelling?
Sidnei is the Portuguese spelling of Sidney, so they are spelling variants.
Global Rank #588
Sidnei
Origin: English
Sidnei is the Portuguese spelling of Sidney, derived from the Old English name Sydnei, which likely means "wide island" or "from Saint Denis," combining elements related to expansiveness or religious…
Which is more popular? Based on real registry rankings, Sidney currently ranks higher globally. Popularity can vary a lot by country — check each name's own page for a full regional breakdown.