Beagle as a pet name is a registry artifact. Someone named their dog's breed in the name field of a licensing form, and those 45 registrations sit at rank 2137 as proof. It's not a name anyone chose deliberately; it's a paperwork collision between the "Name" and "Breed" fields on a city license form.
The Classic Registry Confusion
This pattern appears repeatedly at the lower tiers of pet registry data. A rushed owner filling out paperwork at a shelter writes the breed where the name goes. The result is a name that is technically valid but almost certainly unintentional. See Beagle breed name guide for names that actually suit the breed.
If You Actually Want to Name Your Dog Beagle
There's a tradition of calling a dog by its breed as a nickname. It's self-referential and probably what Snoopy's owners called him before Charles Schulz got involved. The meta joke lands. But you'll explain it every time.
Counter-Reading: Own the Absurdity
If you actually want to name your dog Beagle, commit. The joke is genuinely good on a Beagle. Browse pet names for options that don't require explanation.