Entity Name vs Trademark vs DBA vs Domain: The 4 Registers Behind a Business Name

Most founders treat business name availability as a single yes-or-no question. It is not. A name lives in four separate registers — your state's business entity registry, the federal trademark register, the domain name system, and the social platforms — and none of them consult each other. A name can be perfectly clear in all four, or clear in three and fatal in the fourth. If you just want to check a name against domains right now, start with our business name search tool and come back here for the legal layers.

This is not our framing — it is the government's. The U.S. Small Business Administration's guidance on choosing a business name lists four legally independent registrations — entity name, trademark, DBA, and domain name — and states plainly: "Each of these name registrations are legally independent." We cover all four below, with the DBA filing sitting alongside the entity register because it is filed the same way, and we add a fifth layer the SBA does not address: social platform handles, which carry no legal weight but still cost founders their brand. That single sentence from the SBA is the reason rebrands happen. Founders clear one register, assume they cleared all of them, and print the business cards.

The Four Registers at a Glance

Register 1: Your State's Business Entity Registry

This register answers one narrow question: can you file formation paperwork under this name in this state? That is all. It is administered by your Secretary of State or an equivalent agency, and every state runs its own database with its own rules and its own idea of what counts as "too similar."

The National Association of Secretaries of State maintains a single dropdown that links to the entity search for all 50 states, Washington DC and Puerto Rico. Use it rather than guessing at URLs. Some searches you can run right now:

• California — bizfileonline.sos.ca.gov. The statutory standard is whether your name is "distinguishable on the record" from an existing entity.
• Delaware — ICIS entity name search. Delaware will hold a name for you: reserving an entity name costs $75 for 120 days.
• Texas — the Comptroller's taxable entity search is the free public lookup; the Secretary of State's SOSDirect requires an account.

Run the exact name, then run just the distinctive word on its own — most conflicts surface on the stem, not the full string. Note any dissolved or inactive entities you find, because several states restrict reuse of a recently dissolved name. And if you will operate in more than one state, you have to run the search in each one. A clear result in Delaware says nothing about Illinois.

A DBA ("doing business as," or fictitious business name) is a weaker layer sitting alongside this one. It lets an existing entity or sole proprietor trade under a different name, and it is usually filed at the county level with its own separate search. The SBA is blunt about what it buys you: registering a DBA "doesn't provide legal protection by itself." It is an administrative disclosure, not a claim.

Register 2: The Federal Trademark Register

State registration does not protect you from a federal trademark claim. This is the register with real teeth, and it is the one most likely to force a rebrand after you have spent money.

Search it free at tmsearch.uspto.gov. If you have read an older guide pointing you at TESS, that interface is gone — the USPTO's trademark search page now sends everyone to the current tool and publishes a "Transitioning from TESS" handout for people arriving from the old system.

1. Search your exact name, then filter to live marks. Dead and abandoned marks are usually fair game, though they can still be revived or cited in litigation.
2. Check the class. A trademark only blocks use in the international classes it covers, so a mark registered in Class 25 (clothing) may not touch you in Class 41 (education services).
3. Search phonetically, not just literally. The examining standard is likelihood of confusion, so "Kloud" can collide with "Cloud" in the same class.
4. Search the distinctive stem alone, plus obvious misspellings and pluralisations.

If you decide to file, the fee structure changed and most naming articles still quote the old one. The USPTO fee schedule effective 19 January 2025 scrapped the TEAS Plus and TEAS Standard split and set a single base application fee of $350 per class, plus a $100 per class surcharge for an application missing required information and a $200 per class surcharge for writing your own goods-and-services description instead of using the Trademark ID Manual. If you read "$250 for TEAS Plus" anywhere, that guide predates January 2025.

The Gap the Trademark Register Does Not Cover

A clean USPTO search is not a clean bill of health, because trademark rights can exist without ever being registered. The USPTO states this itself: unregistered rights "known as 'common law' rights, are based on use of the trademark in commerce within a particular geographic area," as explained in its guidance on why to register a trademark. Nobody files those rights anywhere. They exist because a business opened its doors.

The canonical illustration is Burger King of Florida, Inc. v. Hoots, 403 F.2d 904, decided by the Seventh Circuit on 25 November 1968. Gene and Betty Hoots ran a restaurant called Burger King in Mattoon, Illinois before the Florida chain reached the state. The chain held the federal registration and won nationwide rights — but the Hoots' earlier local use survived, and they kept the name in their own market area. A federal registration did not erase a small prior user, and a database search would never have surfaced them. This is why a plain Google search of your name plus your industry and your city is a genuine clearance step, not busywork.

Register 3: The Domain Name System

The domain register is the fastest of the four to check and the easiest to misread. Registering a domain is a contract with a registrar. It is not a property right in the name and it is not a defence against anyone.

For checking, Namilio's business name search queries 21 TLDs in one pass so you can see the whole extension landscape for a candidate at once, and the generator does the same for every name it produces. If a domain comes back taken, ICANN Lookup is the authoritative place to see the registration record — creation date, registrar, expiry, and whatever contact detail is not redacted. A domain registered years ago and parked ever since, with no site attached, is a very different negotiation from one running an active competitor.

On price, the registry sets the floor and registrars mark it up by varying amounts. Cloudflare Registrar states that it "does not mark up domain prices at all" and passes through only the registry and ICANN fees, which makes it a useful reference point for what a domain actually costs before retail margin.

The part founders underestimate: a trademark owner can take your domain away. The Uniform Domain-Name Dispute-Resolution Policy lets a rights holder file a complaint and have the name transferred, without going to court. The WIPO Arbitration and Mediation Center is the largest administrator of these cases, and its published caseload shows 6,282 domain name cases filed in 2025, up from 3,693 in 2019. Buying the domain first does not settle the trademark question — it just gives you something to lose.

Register 4: Social Platform Handles

This is the weakest register legally and the most annoying practically. A handle is governed by one platform's terms of service and confers nothing outside that platform.

It is also the register where the tooling has rotted. The two aggregators most naming guides still recommend are not working: as of 27 July 2026, knowem.com does not resolve at all and namecheckr.com returns a 503 error. We previously linked both from this article and have removed them. Ignore any guide that still sends you there — it has not been checked in years.

The durable method is to load the handle URL on each platform yourself. It is seven URLs and it never breaks:

• Instagram — instagram.com/yourbrand
• X — x.com/yourbrand
• TikTok — tiktok.com/@yourbrand
• YouTube — youtube.com/@yourbrand
• LinkedIn — linkedin.com/company/yourbrand
• Facebook — facebook.com/yourbrand
• Pinterest — pinterest.com/yourbrand

One honest caveat: a 404 does not mean the handle is yours. Platforms reserve strings, suspend accounts without releasing the name, and hold deactivated handles indefinitely. The only proof a handle is claimable is claiming it — so if the name matters, claim it the day you shortlist it rather than the day you launch. Where a handle is already held by a dormant account, the recovery routes differ by platform, none of them commit to releasing a name, and none of them are quick.

When the exact handle is gone, the workarounds that read least like a compromise are a category suffix ("yourbrandhq", "yourbrandco"), a verb prefix ("getyourbrand", "tryyourbrand"), or a location tag for a local business. Avoid underscores and digits — they get lost when someone says the handle out loud.

The Order to Check Them In

Cost of failure should drive sequence. Run the checks that can kill the name before the ones that merely inconvenience you.

1. Domains first, because it takes seconds and eliminates the most candidates. Anything with no viable extension is dead before you invest attention in it.
2. Federal trademark second. This is the check that can force a rebrand years after launch, once you have brand equity to lose. Live marks in your class are disqualifying; do not talk yourself past one.
3. Common law third — the name in quotes, plus your industry, plus your city. You are looking for an active business, not a database entry.
4. State entity registry fourth, in every state you will register in. Fixable with a small variation, so it rarely kills a name outright.
5. Handles last. Never let a taken Instagram handle veto an otherwise clean name. Suffix it and move on.

What Namilio Checks — And What It Does Not

Namilio checks domain availability across 21 TLDs and nothing else. It does not check state business registries, social media handles, or marketplace shop names. On Premium, each generated name is additionally screened against live trademark records across 200+ offices worldwide — a preliminary conflict scan that surfaces obvious collisions in register two early. That scan is not a clearance search, it is not legal advice, and it cannot see unregistered common-law rights. When a name shows as available in Namilio, that is a statement about register three and nothing more. We would rather say that clearly than let you infer legal clearance we did not perform.

What that is genuinely good for is the first pass. Generating candidates and eliminating the domain-dead ones is the highest-volume, lowest-value part of naming, and it is the part worth automating. The generator produces names across fifteen styles and flags extension availability inline, so the shortlist you carry into the trademark search is already filtered. If you are naming a specific entity type, our LLC name generator and startup name generator apply the same check with tuned defaults.

When One Register Blocks You

Which register blocked you determines what you should do about it, and the responses are not interchangeable.

If you are starting over, the fastest route back to a shortlist is to change the input rather than the output — new keywords, a different style, a shorter length ceiling — and re-run. Our guides on how to name your business, choosing a domain name, and trademarking a business name cover each register in more depth than this overview allows.

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