Sox is the playful phonetic spelling of Socks: one of the oldest naming conventions in pet culture, applied to animals with white paws against a darker coat. The X spelling has a visual energy that conventional Socks lacks, and it doubles as a baseball team reference (Chicago White Sox, Boston Red Sox) that gives it an accidental sports dimension.
The White Paws Tradition
Socks-as-name has been applied to white-footed animals for generations, most famously the Clinton White House cat in the 1990s. Sox updates the classic with a more contemporary spelling. It works on any animal with distinctive paw markings: tuxedo cats, Border Collies, any dog with white feet on a dark coat.
The Baseball Reference
White Sox and Red Sox fans have a team loyalty signal available here that purely descriptive names lack: Sox becomes a way to communicate where you're from.
The Counter-Reading: Very Obvious
Sox tells you the animal has white feet. That transparency is either its charm or its limitation. Owners who want a name with hidden depth will find Sox too literal. Owners who want an honest, affectionate descriptor will find it precisely right.