Why Your Lovecraft Cat Needs More Than Just "Nyarlathotep Jr."
Naming a cat after a cosmic horror is straightforward until you actually have to pick one and live with it. I've been doing this long enough to know that the gap between a funny name on paper and a name that works in practice is usually where people fail. They grab the first thing they find on a Reddit thread and then spend three years trying to shorten it or explain it to guests who show up unannounced. The real work here isn't brainstorming. It's understanding how the name will actually function in daily life before you commit to it. A Lovecraft-inspired cat name has to survive three specific stress tests: it has to be callable from another room without sounding like you're summoning something, it has to fit on a collar tag without getting truncated, and it has to not make your houseguests uncomfortable at family gatherings. Most names fail at least one of these.
The Cosmic Feline Choosing The Perfect Hp Lovecraft Cat Name
What I call the process is really just a funnel. You start with a big list of Lovecraftian references, you apply filters, and what survives becomes your cat's name. The filters matter more than the starting list. I've watched people spend weeks on the first step and skip straight to adopting the first cute-looking name that came to mind. Start by listing every Lovecraft name, entity, and concept you can think of. Don't filter anything yet. Get it out of your head and onto paper or a document. I usually end up with around forty to sixty candidates. Some are obvious. R'lyeh, Cthulhu, Azathoth. Others are stuff you remember from reading the works back in college and haven't thought about since. Yog-Sothoth, Dagon, Shub-Niggurath, Hastur, Tsathoggua, Ithaquen, Zhar, Lloigor, Gobogog. Next, run each candidate through the phonetic test. Say the name out loud three times fast. If you stumble or it requires more than two breaths, it's probably not going to work as a calling name. Cats respond to hard consonants and clear vowel sounds. A name like Y'golonac falls apart when you're trying to get your cat off the kitchen counter at 6 AM. It's also just too easy to mispronounce in front of other people, which means you'll end up using a nickname anyway and the whole exercise was pointless.
Then check the pet name potential. Almost every multi-syllabic Lovecraft name needs a natural shorthand. If the shorthand isn't obvious, you've got a problem. From Cthulhu you get Lou. From Hastur you get Stu or Star. From Nyarlathotep you get Nate or Lyra. From Yog-Sothoth you get Yog or Soth. From Shub-Niggurath you get Shub or Niggy, though I would not recommend the latter version. The shorthand is what you'll actually say ninety percent of the time. Pick a name whose shorthand feels right on its own. After that comes the visual check. Write the name as it would appear on a tag. Not the Anglicized version from a wiki. The version with diacritics and apostrophes and all that mess. Most tag printers and engravers will either strip special characters or turn them into question marks. If your chosen spelling includes Yiddish-style apostrophes and you have to decide between accuracy and legibility, accuracy loses. Always.
Get the Full Details

Names That Actually Work Well
From my experience, these tend to survive the filter process without too much damage: Dagon. One syllable. Clear sound. Pet form is just Dagon, which happens to work fine. Tag engraving is trivial. The only downside is that people will assume you named the cat after the fish-like entity and they might bring it up at dinner parties. It's fine. Azath. Short for Azathoth but usable on its own. Two syllables, sharp sounds. Works as both the full name and the calling name. I've used this one personally and it hasn't caused a single issue in three years of ownership.
Yog. Yes, it's a fragment of Yog-Sothoth, but it functions as a complete pet name. Short, punchy, impossible to mess up phonetically. It also avoids the full theological baggage of the source material if you're not into sharing that with people who didn't ask. Tsath. Short for Tsathoggua. Again, fragments work better than you'd expect. Tsath sounds like a legitimate cat name that happens to have a deeper origin. Most people won't catch the reference unless you point it out, which is exactly the right level of obscurity. Carolus. From the Necronomicon's author Alhazred, sometimes rendered as Khalid ibn Akhzar but the Latinized Carolus shows up in a lot of Lovecraft-adjacent literature. It's a genuine human name on the surface, which solves the family-gathering problem entirely. People ask why it's unusual and you tell them it's from a fictional grimoire and they move on.
The Problem With Most Lovecraft Names for Pets
The biggest issue is overreach. People want the most epic, most accurately spelled, most deeply referenced name they can find. They pick Ithaquen and then spend the rest of the cat's life saying Ick-en instead of the actual pronunciation because nobody can manage the full thing. Or they pick Shudde-Mell and then regret it when the veterinarian keeps writing it as Shudded Mellow on medical records. There's also the spelling trap. Lovecraft himself was inconsistent across different stories. Different publishers have different accepted spellings. The anglicized versions you see on Wikipedia are rarely what he actually wrote in the original text. When you commit to a specific spelling for a tag or microchip registration, you're locking in a choice that may contradict every other source you consulted. It doesn't matter for a cat. It matters for you if you care about accuracy, and caring about accuracy with Lovecraft is a bottomless pit. Another problem I ran into firsthand involved a name that sounded perfect on paper but became a daily annoyance in practice. I once chose a name that was three syllables with a schwa sound in the middle, which made it nearly impossible to distinguish from a standard word when called across a yard. My neighbor thought I was yelling at them. That lasted about two weeks before I switched to the two-syllable shortened version and never looked back. The workaround was simple: test the name at volume in an open space before committing. Record yourself calling it on your phone and play it back while standing twenty feet away. If you can't tell what you said, someone else definitely can't either.

What to Avoid
Don't use full names that require phonetic spelling instructions. If you have to tell people how to say it, it's too complex. Don't use names with apostrophes that will get stripped by every automated system you register the cat through, including microchip databases and veterinary software. Don't pick something so obscure that you're the only person who gets the reference. There's no reward for that. Also avoid the temptation to name the cat after the entity in a way that implies a personality claim. A cat named after Nyarlathotep isn't going to behave any differently than a cat named after a minor demon. The attribution is decorative, and treating it as predictive leads to disappointment and poor name choices.
Final Practical Note
The best Lovecraft cat names are the ones that work as normal cat names first and reference the source material second. You want a name that stands on its own when someone asks "what's their name" and you can say it without elaboration. The Lovecraft connection is the bonus, not the requirement. Start there and work backward through the filters rather than starting with the reference and hoping it survives contact with reality.