Lupin arrives from two compelling directions: Remus Lupin, the werewolf professor in Harry Potter, and Arsène Lupin, the French gentleman thief of early 20th-century fiction. Both are clever, morally complicated characters who happen to be extremely charming — which maps surprisingly well onto dogs and cats with independent personalities.
The Dual Literary Heritage
Remus Lupin's lupine (wolf-derived) surname made his werewolf nature a long-foreshadowed reveal in Prisoner of Azkaban. The Netflix series Lupin (2021) renewed Arsène Lupin's cultural presence for a new generation. A pet named Lupin draws on whichever reference the owner prefers — or both simultaneously. Huskies and wolf-adjacent breeds wear the wolf etymology especially well.
The Botanical Third Option
Lupin is also a flowering plant — the tall, spiky wildflower that blooms in cottage gardens. Owners who choose Lupin for a cat or smaller dog may be drawing on this more pastoral reference rather than the literary ones, fitting neatly into the broader cottagecore aesthetic in pet naming. See also Flora and Sage for similar botanical energy.
The Counter-Reading
Lupin's werewolf association can invite jokes about full moons that get old quickly. The French pronunciation (loo-PAN) versus the English one (LOO-pin) also creates a small social friction point. The human name Lupin is rare enough that the pet version has the field essentially to itself.