Sidney at rank 1173 for male pets is a classic surname-name with a particular pedigree: more bookish than athletic, more English-manor than ranch. The -ey spelling distinguishes it from the more common Sydney and leans slightly more masculine, slightly more formal. A dog or cat named Sidney tends to have an owner who appreciates a name with quiet elegance over obvious impact.
Surname Origins
Sidney as a given name traces to Saint-Denis in Normandy — the Saint Denis connection anglicized over centuries into Sidney. Sir Philip Sidney, the Elizabethan poet and soldier, is its most famous historical bearer; Sidney Crosby, the hockey player, is its most famous contemporary one. The human Sidney has long occupied a space between formal and approachable that translates naturally to pets.
The Spelling Matters
Sydney (with a y) runs significantly higher in pet registries, partly because of the Australian city association and partly because the -y ending feels more casual. Sidney with an i reads as more deliberately chosen — the owner thought about the spelling, which suggests they thought carefully about the name itself. That intentionality tends to produce names that suit their animals well.
Personality Projection
Owners who name pets Sidney often describe them as "distinguished" or "professorial" — animals with a slightly knowing quality. British Shorthairs and Standard Poodles are natural fits. The name rewards a pet with genuine personality rather than just good looks.