Sydney ranks at #388 with 319 entries, leaning female. The name has cycled through three distinct cultural registers over the past 40 years (surname-as-given-name, place-name for Sydney, Australia, and TV-show character name), and pet-naming volume reflects that layered footprint.
The unisex-surname register
Sydney clusters with Riley, Avery, and Dakota in the surname-style unisex naming cohort that took off in human baby naming through the 1990s and 2000s. The Sydney baby name page shows the SSA chart climbing through the late 1990s, peaking in the early 2000s, and softening since — the pet version has tracked that wave with the typical decade-plus lag.
The Alias layer
Sydney Bristow on Alias (Jennifer Garner, 2001-2006) cemented the name's confident-feminine register for a generation of millennial viewers. Some owners arrive through that route specifically — Sydney as a name for a smart, capable dog rather than a cute one. The reading still shows up in how owners describe the name's tone.
Sound and breed fit
The two-syllable shape (SID-nee) has a soft front consonant and a singable trailing vowel, projection-friendly for outdoor recall. Sydney lands across breed sizes but over-indexes on medium dogs with confident, friendly temperaments — Goldens, Labs, Australian Shepherds (where the place-name and breed origin align), and athletic mixed breeds. The clean sound suits dogs with active lifestyles rather than purely lap companions.