Why Luna is the #1 cat name in basically every city in America

If you adopted a cat in the last ten years, there’s a meaningful chance you considered naming her Luna. There’s also a meaningful chance you went ahead and did it — because so did roughly one out of every fifty other people who adopted a female cat in the same year.

Luna’s dominance is the most boring true thing in cat-naming. Every shelter knows it. Every veterinary office sees it on a third of their female-cat charts. Every pet insurance company’s annual “top cat names” report leads with it. And yet most lists treat the fact as a footnote — also popular: Luna — without asking the more interesting question. Why this name? Why now? Why everywhere?

We pulled the data, then thought about it for a while. Here’s what we found.

How big is “Luna big,” really

The cleanest data on cat naming comes from cities that publish their pet license records. Three cities publish enough to be useful: Seattle, Toronto, and Vancouver. In all three, Luna is either the #1 female cat name or within a hair of it for every year of the last decade. In Seattle, Luna has been #1 every year since 2016. In Toronto, Luna and Bella have traded the top spot, with Luna pulling ahead in 2020 and never giving it back. Vancouver, much the same.

Pet insurance company data — Nationwide, Healthy Paws, Trupanion, Lemonade — tells the same story across all 50 US states. Rover’s annual reports tell it across their entire customer base. The Cat Fanciers’ Association tells it across registered purebreds. There is no major US data source where Luna isn’t the top female cat name or in a statistical tie for it.

That kind of agreement across data sources is rare. For human baby names it almost never happens — the top US baby names diverge wildly between the SSA registry, BabyCenter surveys, and Nameberry. For cats, every measure points to Luna.

So: somewhere between 1.5% and 3% of female cats adopted in the last five years in the United States are named Luna. That sounds small until you realize the second-most-popular name (usually Bella) accounts for maybe 1%, and the long tail past the top 20 is so flat that no individual name accounts for more than 0.2% each. Luna is a spike. Everything else is the curve.

Why Luna won

A handful of explanations get repeated. Some of them are right, some are partly right, and one is doing more work than people give it credit for.

Sailor Moon was the seed

The first generation of Luna cats was almost certainly named after the black cat in Sailor Moon — the talking cat with the crescent moon on her forehead. The original anime aired in the US starting in 1995, and a cohort of millennial cat owners (mostly girls who watched it between ages 8 and 14) carried the name into adulthood. You can see this in the data: Luna was a quietly popular cat name in the late 1990s and through the 2000s, but not yet dominant. It was incubating.

Then Harry Potter widened it

Harry Potter and the Order of the Phoenix introduced Luna Lovegood in 2003. The film adaptation arrived in 2007. Suddenly Luna wasn’t just an anime reference — it was a name shared by a beloved Hogwarts oddball who liked invisible animals and read the newspaper upside down. The Luna Lovegood association expanded the name’s appeal beyond the anime crowd to the much larger Harry Potter readership.

That’s when Luna started crossing over from cat name to baby name. The US Social Security Administration data shows Luna entering the top 1000 baby names for girls in 2003 and climbing every year since — top 100 by 2018, top 20 by 2023. The cat name and the baby name rose in parallel.

If you want more of these crossover names with literary roots, our Harry Potter cat names collection has the rest.

Astronomy themes were on the rise

The broader cultural trend that Luna rode is the astronomy-themed pet name boom. Look at the data and the top female cat names of the last decade are all astronomical: Luna, Stella, Nova, Aurora, Cosmo, Stella, Lyra, Vega, Astro. The trend is real and durable — astronomy names have been gaining on classical (Athena, Penelope) and food (Mochi, Peaches) names for the last fifteen years.

Luna is the most accessible name in this set. It’s short. It’s pronounceable in every language. It means something specific (the moon) without requiring you to explain. And it has the rare property of being beautiful in its meaning and its sound.

Our full astronomy names theme has 80 more if you want to go deeper.

The sound is engineered for cats

There’s a real reason Luna works as a cat name beyond cultural momentum, and it gets less attention than it should.

Cats, like dogs, respond strongest to names with two syllables, open vowel sounds (especially “oo” and “ah”), and soft consonants at the boundaries. Luna hits all three. /ˈluː.nə/ is two syllables, ends on a soft schwa, and the long “oo” in the first syllable carries — it projects across a room. If you were trying to design a name from acoustic principles to be maximally cat-friendly, you’d land somewhere very close to Luna.

(We wrote more about this in why two-syllable cat names work best. The short version: it’s not aesthetics; it’s biology.)

This is also why the other top cat names tend to have similar sound profiles: Bella (two syllables, open vowels, soft L), Lily, Stella, Daisy, Mochi, Coco, Nala. The acoustic structure is doing real work.

Where Luna lost

There are a few places Luna doesn’t dominate, and the exceptions are illuminating.

Japanese-speaking households. In data from Japanese pet registries, the top female cat names skew toward Japanese-origin names — Sakura, Hana, Momo, Mei, Yuki. Luna shows up but doesn’t break the top 5. Cultural specificity wins.

Spanish-speaking households. Similar story — Spanish cat names like Sofia, Frida, Estrella, and the locally beloved Mía outrank Luna in registry data from Spain, Argentina, and Mexico, although Luna itself is Spanish for moon and remains very common there. In US Hispanic households, Luna actually does even better than the national average, since it’s bilingual and reads naturally in both languages.

Senior cat adoptions. People adopting older cats (5+ years) tend to keep the existing name or pick something more grounded — Maggie, Lily, Sadie. Luna skews toward kittens, perhaps because it sounds like a kitten name. People naming a dignified ten-year-old don’t reach for it as instinctively.

Black cats specifically. Black cats are the only coat color where Luna isn’t the runaway favorite. There, Salem, Pepper, and Shadow are competitive, partly because the visual association is so strong. (We have a whole piece on black cat names if you’re working with that constraint.)

What this tells us about cat naming generally

The Luna phenomenon is a useful lens on how cat-naming actually works in 2026. Three things stand out.

First, cats inherit baby-name trends, but with a five-to-ten-year lag and an amplification effect. Names that become popular for human babies tend to become very popular for cats a few years later, and the top of the cat distribution is much spikier than the top of the human-baby distribution. Cat owners are more likely to converge on the single most familiar option.

Second, the cultural source matters less than people think. Once a name crosses some threshold of recognition, it stops being “the Sailor Moon name” or “the Harry Potter name” and just becomes “a name.” Most people naming their cat Luna in 2026 aren’t thinking about either Lovegood or the anime — they’re thinking that Luna is pretty and means moon. The original reference recedes; the name becomes a default.

Third, the strongest cat names are the ones that survive being too popular. Luna has been a top-3 cat name for a decade and still doesn’t feel tired. Bella, by contrast, was massive for a few years and now reads as slightly dated — too tied to Twilight. The names that age best tend to be the ones with deep, generic meanings (Luna = moon, Stella = star) rather than the ones with single sharp cultural sources.

So — should you name your cat Luna?

The case against is mostly aesthetic: there are already a lot of Lunas at the vet, you’ll occasionally meet another one at the park, and if you announce it at a dinner party at least one person will say “oh, my friend has a Luna too.” That’s the cost of picking a popular name.

The case for is everything else. It’s acoustically excellent. It means something beautiful. It works in multiple languages. It pairs well with about 80% of cat coat colors and personalities. And — this matters more than people admit — it’s a name your cat will respond to faster than almost any other, because the sound is doing the work.

If you want something just a little less common, the closest cousins are Lyra, Selene, Lune (the French form), Cressida (a moon of Uranus), and Phoebe (a moon of Saturn). All in our astronomy theme, all acoustically very similar to Luna, none anywhere near as common.

But if you’ve already decided on Luna, you’re in extremely good company. The data agrees with you.

Where to go next

If this piece interested you, three places to keep reading:

• Astronomy cat names — Luna’s whole neighborhood, with 80 more options
• What pet license data tells us about how people actually name cats — the broader trends behind Luna’s rise
• Why two-syllable cat names work best — the acoustic argument in more detail

Or browse all themes to keep exploring.