Rupert ranks at #676 with 180 entries, registered male. The name is the English form of the Germanic Hrodperht, a cousin of Robert through the same Old Germanic root. On a pet it carries a deliberately British, slightly aristocratic register that makes it one of the most distinctive small-dog picks on the chart.
The British-formal cohort
Rupert clusters with Winston, Oliver, Reginald, and Bertie in the formal-British-male pet pocket. The cohort skews toward owners drawn to the bear-in-a-tweed-coat aesthetic, with a Rupert Bear children's-book overlay for owners with British family ties (the character debuted in 1920).
Breed lean and sound
The name lands disproportionately on small-to-medium dignified breeds — Cavaliers, Cockers, English Bulldogs, and Bichons. Two syllables, front-stressed (ROO-pert), with crisp recall. The name reads small and dignified rather than large and athletic.
The counter-reading
Rupert is unambiguously British in register, and on an American sidewalk the name surfaces a brief raised eyebrow with most strangers. Owners comfortable with the deliberate signaling pick the name without hesitation; owners who want a more neutral pet register sometimes course-correct to Rocky or Rusty.
The human Rupert page shows minimal SSA presence — the name is dramatically more common in the UK than the US. Pet Rupert is one of the few cases where the pet register is more visible than the human register stateside. Browse other British-formal picks.