How to check if a startup name is trademarked
You have a name you like, and the question is whether someone already owns it. The fast way to find out is a knockout search: a structured pass over the US and EU trademark registers that surfaces the conflicts worth worrying about before you build on the name. Here is how to run one by hand, how to read what comes back, and where the line sits between a search and actual clearance.
What “trademarked” actually means for a name
A trademark is not ownership of a word. It is a right to use a name as a brand for a specific category of goods or services, granted per Nice class, the 45-class system both registers use. The same word can be held by unrelated businesses in unrelated classes, which is why “is this name trademarked?” has no yes-or-no answer on its own. The real question is narrower: is there a registered or pending mark that is identical or confusingly similar to your name, in or near the class you will operate in? That is what a knockout search is built to answer. It will not tell you the name is free; it tells you whether obvious conflicts exist, which is how you eliminate bad candidates early instead of after you have printed them on contracts.
Search the two registers that matter
For most startups operating in English-language markets, two registers carry the weight: the USPTO in the United States and the EUIPO in the European Union. Both are public and free to search directly.
- USPTO: use the Trademark Search system at uspto.gov (the tool that replaced TESS). Start with the exact name, then broaden.
- EUIPO: use eSearch plus, which covers EU trade marks filed centrally, and TMview for a wider, multi-office sweep across national registers as well.
Search both. A name can be clear in the US and blocked in the EU, or the reverse, and a single-jurisdiction search gives you false confidence. If you will sell in other markets too, the relevant national registers belong in the search, but USPTO and EUIPO are the floor for an English-language startup.
Run it three ways: exact, phonetic, fuzzy
A naive search checks the exact spelling and stops. That misses most real conflicts, because registers protect against confusion, not just duplication. Run the search three ways.
- Exact. The literal spelling. An identical registered mark in your class is the clearest possible conflict and the fastest disqualifier.
- Phonetic. Names that sound alike collide even when spelled differently. “Kandid” and “Candid”, “Klariti” and “Clarity”. Examiners and courts weigh sound, so a sound-alike in your class is a genuine risk, not a technicality.
- Fuzzy. Near-spellings, one or two characters off, plurals, and common prefixes or suffixes. A mark that is one letter from yours can still be judged confusingly similar.
Weight everything you find by class. A phonetic match in an unrelated industry may not matter; the same match inside your own Nice class is the one that can stop you. Identify your likely classes before you search: most software lands in class 9 (downloadable software) and class 42 (SaaS and technical services), fintech adds class 36, health adds 44 and 5, and a marketplace adds 35. Search those first.
How to read what comes back
A result list is a signal to interpret, not a verdict to obey.
- Status matters. A live registered mark in your class is a hard stop. A pending application is a warning. An abandoned, cancelled, or expired mark is weaker, though a famous lapsed brand can still cause problems.
- Class proximity matters. A conflict squarely in your class outweighs a similar mark three classes away. Watch for marks registered across many classes; well-known brands often hold broad coverage that reaches beyond their core category.
- Goods and services matter. Read the actual description filed with the mark, not just the class number. Two software companies in class 9 can coexist if what they sell does not overlap, and can collide if it does.
A clean knockout means no direct or similar conflicts surfaced in your class, which is your cue to keep going. A surfaced conflict means change the name or get advice before you commit. What the search cannot do is clear the name for use: it surfaces potential conflicts; it does not certify their absence. When the answer carries real money or legal exposure, that judgment belongs to a qualified trademark attorney who can run full clearance and a registrability opinion.
Do the knockout automatically
Running exact, phonetic, and fuzzy passes across two registers, then reading status and class on every hit, is slow to do well by hand. startupnamegenerator runs it as a single knockout search: enter your name and it screens it against the US (USPTO) and EU (EUIPO) registers with exact, phonetic, and fuzzy matching, weighted by Nice class, and reports what the registers show, dated. The trademark check is free once a day, then Pro ($19/mo, 50 checks/mo) or Ultimate ($49/mo, 150/mo) when you are screening a whole shortlist. The same tool generates names with an available .com checked live against the registry, so if your name does not survive the screen you can find a replacement in the same place. If you build with AI agents, the screen is also exposed as an MCP server, an HTTP API, and a CLI, so the assistant doing your research can call it directly instead of guessing.
Questions, answered
How do I check if a startup name is trademarked for free?
Search the public registers directly: USPTO Trademark Search for the United States and EUIPO eSearch plus, with TMview for a wider sweep, for the European Union. Run the exact spelling plus obvious sound-alikes, and look inside the class of goods or services you operate in. startupnamegenerator automates this as a single knockout search across both registers, free once a day. It surfaces potential conflicts; it is not legal clearance.
Can I use a name that is already trademarked in a different industry?
Sometimes. Trademark rights are granted per Nice class, so the same word can be held by unrelated businesses in unrelated classes. But the lines between classes are not always clean, related goods can conflict across class boundaries, and a famous mark can reach well beyond its own class. A registry search shows you the conflicts; whether you can safely proceed is a question for a trademark attorney.
What is a trademark knockout search?
It is a fast first-pass search of the trademark registers to knock out names that clearly collide before you invest in any of them. You run the name exact, phonetic, and fuzzy, inside your likely Nice classes, and eliminate anything with a direct or confusingly similar registered mark. It is a screen to narrow a shortlist, not a clearance opinion and not legal advice.
Is a registry search the same as legal clearance?
No. An automated registry search finds direct and similar matches quickly, which is how you eliminate bad names early. It is not a clearance opinion, not a guarantee, and not legal advice. Registries also change daily, so results are dated. Before you file the mark or print the name on contracts, have a qualified trademark attorney run full clearance.
Should I check the domain too?
Yes, in parallel. A trademark search tells you nothing about whether the .com is available, and a clear .com tells you nothing about the mark; the two are separate gates and a name worth keeping clears both. startupnamegenerator only generates names whose .com is available at generation time, then lets you run the trademark knockout on the one you like.
Related: using a name trademarked in another industry, do you need to trademark your name, and checking if the .com is available.
Trademark results are an automated database search against the USPTO and EUIPO registries, not legal advice and not a clearance opinion. Registries change daily; results are dated. Before filing, have counsel run full clearance.