Beba registers 63 times at rank 1621 on female pets. It's a diminutive used across several Spanish and Slavic naming traditions: a short form of Rebeca in Latin American Spanish, and a baby-talk endearment in Serbian and Croatian. In a U.S. pet registry, it most likely reflects the first path, a nickname that owners from Spanish-speaking households formalized on the registration form.
The Cultural Diminutive Register
Beba is the kind of name that sounds like it was already in use before it ever went on paper. Owners who choose it are often registering what the pet is already called. It sits alongside Coco and Lola in the Latin-American diminutive pet-naming tradition: warm, rounded, affectionate. The human-name angle is at /names/beba.
Sound and Breed Fit
BEH-bah is two syllables, both open vowels, with a natural warmth in the repetition of the "b" sound. It suits small female dogs and cats, especially Chihuahuas and small mixed breeds. The name feels intimate rather than formal, which is entirely the point.
The Counter-Reading
Beba's closeness to "baby" in several languages means non-Spanish speakers occasionally register it as an endearment rather than a name. That's minor conversational friction, not a real problem. The name works exactly as intended for owners who chose it.