Ludo is the gentle giant from Jim Henson's Labyrinth (1986) — a massive, shaggy creature who turns out to be completely soft-hearted. That combination of imposing size and absolute sweetness makes the name ideal for large, fluffy dog breeds, and it's clearly why this name persists in pet registries decades after the film.
Labyrinth's Lasting Influence
The 1986 film has an extraordinarily devoted cult following, and its character names appear in pet registries with consistent regularity. Ludo specifically maps almost perfectly onto big, friendly dog breeds: the association between the fictional Ludo's enormous frame and gentle temperament is too good to pass up for owners of Newfoundlands, Bernese Mountain Dogs, or similarly large gentle giants.
The Sound Argument
Ludo is two syllables ending in an open vowel — a classic pet-name structure. It's warm, easy to call, and doesn't share phonemes with common training commands. The "oo" vowel carries well outdoors. From a purely functional standpoint, it's a good name independent of the film reference.
Counter-Reading: Size Irony Risk
Ludo on a small dog is a joke. It's a fine joke — the Labyrinth Ludo would probably find it funny — but it's a joke that requires explaining. If you have a tiny dog and love the name, go for it with full awareness that "Ludo" will prompt the same conversation at every vet visit and dog park encounter. Browse similar names at NamesPop.