Willy ranks at #633 with 195 entries, registered male. The name is the friendly diminutive of William, and on a pet registry it carries the same casual-buddy register as Johnny and Larry: a deliberately ordinary human nickname placed on a dog as the household's casual register.
The Free Willy effect
For owners who came of age in the 1990s, Willy carries an unavoidable Free Willy overlay. The 1993 film about a captive orca named Willy was a defining childhood-movie moment for a generation, and a slice of millennial owners reach for Willy on a black-and-white dog or rescue specifically because the movie association sits warmly. The naming logic is half nickname, half nostalgia.
The Wonka and Shakespeare overlays
Willy also carries lighter overlays: Willy Wonka (Roald Dahl's 1964 character, carried to film in 1971 and 2005) for the whimsical register, and Willy Loman from Death of a Salesman for older literary-leaning owners. None of these dominate; Willy works as a friendly cover-all nickname that owners interpret freely.
Sound and breed lean
Two syllables, front-stressed (WILL-ee), with a soft opening and clean recall. The shape is excellent for yard-call. The name lands across a broad breed range without strong concentration: Labradors, Jack Russells, Beagles, and friendly mixed-breeds. The human Willy page shows mid-century SSA presence and a long decline; pet Willy carries the warmth that human Willy has nearly fully vacated.