How to Name Your Delaware Company: Rules, Restrictions, and Availability

Naming your company is the first genuinely creative decision in the formation process — and one of the few that’s hard to change later without a filing. Delaware makes the rules refreshingly straightforward, but there are a handful that trip people up, and one distinction almost everyone gets wrong: an available name is not the same as a protected name.

Here’s what Delaware requires, what it prohibits, and how to check whether the name you want is actually free.

The one required element: a designator

Every Delaware entity name must include a word or abbreviation that signals its structure, whether you’re forming an LLC or a C-Corp.

For an LLC, the name must contain one of:

• Limited Liability Company
• LLC
• L.L.C.

For a corporation, the name must contain one of:

• Corporation / Corp.
• Incorporated / Inc.
• Company / Co.
• Association, Club, Foundation, Fund, Institute, Society, Union, Syndicate, or Limited (and their abbreviations)

So “Blue Harbor” isn’t a valid company name on its own — “Blue Harbor LLC” or “Blue Harbor Inc.” is. The designator is what tells the public, and the state, what kind of entity they’re dealing with.

The core rule: your name must be “distinguishable”

Delaware won’t register a name that isn’t distinguishable upon the record from an existing entity already on file. In plain terms: it can’t be the same as, or confusingly close to, a name already taken.

What generally does not make a name distinguishable:

• Adding or removing the designator (“Blue Harbor LLC” vs. an existing “Blue Harbor Inc.”)
• Changing punctuation, spacing, or capitalization
• Switching between singular and plural (“Harbor” vs. “Harbors”)
• Adding articles like “the” or “a”

What generally does: a meaningfully different word in the name. The distinction is about whether the names are genuinely different, not cosmetically different.

Because this is judged against Delaware’s live records, a name that was free last month may be taken today. Checking against current data — not a cached list — is what tells you whether you can actually file.

Restricted and prohibited words

Some words are off-limits or require special approval, usually because they imply a regulated activity:

• Banking terms — “bank,” “trust,” and similar generally require approval from state banking regulators
• Insurance terms — often require clearance tied to insurance regulation
• “University,” “college,” “academy” and related education terms can require approval from education authorities
• Words implying a government affiliation (that the company is a state or federal agency) aren’t permitted
• Certain professional terms may require that the entity actually be licensed for that profession

Most founders never touch these — but if your brand name flirts with a regulated field (“Meridian Trust,” “Founders University”), expect an extra approval step or a rejection.

Characters, language, and formatting

• Standard Latin letters, Arabic numerals (0–9), and common symbols are accepted
• The name must be expressible in characters the state’s system can record — if your brand uses non-Latin script, you’ll file a romanized version
• Some symbols are accepted in filings but can create friction later with banks and payment processors, which don’t always handle them cleanly. A name that’s clean and typeable tends to save headaches downstream.

Available ≠ protected: the distinction that matters most

This is the point worth slowing down for, because it’s where founders make expensive assumptions.

Name availability in Delaware means one thing only: no other Delaware entity is using that exact name. It says nothing about whether the name is legally yours to use as a brand.

A name can pass Delaware’s availability check and still:

• Infringe a federal trademark held by another company
• Conflict with a brand operating in your industry in other states or countries
• Be unregistrable as your own trademark because someone got there first

Delaware’s registry and the US trademark system are entirely separate. Clearing one does not clear the other. For a company that plans to build a brand — a product name, a logo, marketing — a federal trademark search is a separate and important step, and one worth taking before you commit to a name, print materials, or buy the domain. (See our guide on trademarking your brand as a foreign founder for the full process.)

The short version: Delaware tells you if you can register the name. A trademark search tells you if you can safely own it. You want both answers.

Reserving a name vs. just filing

If you’ve settled on a name but aren’t ready to form yet, Delaware lets you reserve it for a set period (currently 120 days) for a small fee, holding it against your future filing.

For most founders forming right away, reservation is unnecessary — filing the formation document itself secures the name. Reservation earns its keep when there’s a gap between deciding and filing, or when you’re lining up several names and want to lock one while you finalize the rest.

A practical naming sequence

1. Draft a shortlist — a few names, not one, since your first choice may be taken
2. Check availability against Delaware’s live entity name records (available through the Delaware Division of Corporations) for each option
3. Run a US trademark search on the survivors, especially if you’re building a consumer brand
4. Check domain and social handles in parallel — a legally free name with no usable domain is a headache
5. File (or reserve, if you’re not ready)

Doing these in order saves you from the common trap: falling in love with a name, filing it, then discovering the trademark or the domain is gone.

FAQ

Can two companies have the same name in different states?

Yes — availability is state-by-state. A name free in Delaware may be in use in California, and vice versa. This is also why the Delaware check isn’t a trademark check.

Does the name determine my branding?

Your legal entity name and your public brand can differ. Many companies operate under a “doing business as” (DBA) name distinct from their registered name. Your Delaware filing governs the legal name; branding is a separate layer.

Can I change the name later?

Yes, by filing an amendment with the state (and paying the fee), then updating your EIN records, bank, and everywhere else the name appears. It’s doable but not free or instant — which is why getting it right up front is worth the effort.

Does “LLC” have to be at the end?

Conventionally it appears at the end, but the requirement is that the designator be part of the name — placement conventions aside, what matters is that it’s present and correct.

Cooperative is not a law firm and does not provide legal advice, including trademark advice. This article describes Delaware’s publicly available naming requirements for general informational purposes as of the date of publication. Rules and fees change; verify current requirements with the Delaware Division of Corporations, and consult a qualified attorney for trademark clearance or legal questions about a specific name.