Susie ranks at #645 with 190 entries, registered female. The name is the friendly diminutive of Susan, with a strong mid-century-American human-naming register, and on a pet registry it lands as a deliberately-vintage feminine pick that owners use as the full registered name rather than a casual nickname.
The vintage-affection cohort
Susie sits with Sadie, Maxie, Goldie, and Queenie in the vintage-feminine-with-ie pet pocket. The cohort is concentrated among design-conscious millennial and Gen X owners who lean into mid-20th-century American naming aesthetics. The naming logic refuses contemporary pet-cute: the owner picks a name that sounds like a 1955 great-aunt and commits to it.
The Calvin and Hobbes overlay
For a meaningful slice of millennial owners, Susie carries a Susie Derkins overlay (the no-nonsense neighbor girl in Bill Watterson's Calvin and Hobbes, 1985-1995). The character's combination of intelligence and slight grumpiness reads cleanly onto a small expressive dog who knows her own mind. The cohort is real, even if most owners would not name the reference unprompted.
Sound and breed lean
Two syllables, front-stressed (SOO-zee), with a soft sibilant opening and clean recall. The name carries reliably outside. It lands disproportionately on small-to-medium friendly breeds: Cocker Spaniels, Cavaliers, Dachshunds, and small mixed-breed companions. The human Susie page shows strong mid-century SSA presence and a long decline; pet Susie carries the warmth that human Susie has largely vacated.