Delaware Corporation Name Search and Naming Rules

Delaware maintains a public name availability search through the Division of Corporations. Before you commit to a name — printing anything, building a brand, or filing — check it against the state's records at the Delaware name search tool.

Search smart, not just literally

• Search your exact proposed name first
• Then search close variations — different word order, singular vs. plural, common misspellings, and names that differ only by a designator
• Consider how the name sounds, not just how it's spelled; near-identical-sounding names can be a problem

The search tells you whether a name is already taken by another entity on Delaware's records. It's a preliminary check, not a formal reservation — availability today doesn't guarantee availability tomorrow, since someone else could file in the interim. If the name is critical, follow the search with a reservation.

Delaware requires your corporate name to be distinguishable on the records of the Division of Corporations from the names of other entities already registered — corporations, LLCs, limited partnerships, and the rest. "Distinguishable" is a legal standard, and it's stricter than "not identical."

What usually doesn't make a name distinguishable

Small differences generally don't count as distinguishable on their own:

• Adding or removing a word like "the," "a," or "and"
• Changing only the corporate designator (e.g., "Inc." vs. "Corp." on an otherwise identical name)
• Differences only in punctuation, spacing, or capitalization
• Singular versus plural of the same word

If your proposed name differs from an existing one only in ways like these, Delaware may reject it as not distinguishable. When you find something close in the search, assume it's a conflict and adjust rather than gambling on the filing clearing.

Why it matters

A rejected certificate doesn't just cost the filing fee — it costs the days it takes to discover the rejection, pick a new name, and refile. For anyone racing a deadline, clearing the name properly up front is far cheaper than a rejection loop.

Beyond being distinguishable, your name has to follow Delaware's content rules for corporations.

Required designator

A Delaware corporation's name must include a word or abbreviation showing it's a corporation — one of: "Corporation," "Incorporated," "Company," "Limited," or an abbreviation such as "Inc.," "Corp.," "Co.," or "Ltd." The designator is part of the legal name and appears on your certificate. (Note that "Company" or "Co." alone can be ambiguous with other entity types, so many corporations use "Inc." or "Corp." for clarity.)

Restricted and prohibited words

• Words implying a regulated activity — like "bank," "trust," "insurance," or "university" — are restricted and generally require approval from the relevant regulator or additional documentation
• The name can't imply a purpose the corporation isn't authorized to pursue
• It can't be misleading about the nature of the entity

Keep it consistent

The name on your Certificate of Incorporation is your corporation's legal name, and it needs to match across your EIN application, bank account, and contracts. Decide on the exact spelling, punctuation, and designator before you file, because that exact string follows the corporation everywhere.

If you've found an available name but aren't ready to file the certificate, Delaware lets you reserve it. A name reservation holds the name for 120 days, keeping anyone else from registering it while you finalize your share structure, incorporator, and registered agent.

When reservation makes sense

• You've settled on a name but need time to line up the rest of the formation
• You're coordinating a brand launch and need certainty the name will be available when you file
• Multiple founders need to agree, and you want to lock the name during the discussion

Reservation is optional. Many people search, confirm availability, and file the same day, skipping reservation entirely. But when the name is central to a launch and you can't file immediately, the reservation is cheap insurance against losing it to another filer in the meantime.

This is the point that catches business owners off guard, and it's the most important thing on this page. Clearing a name with the Delaware Division of Corporations means no other Delaware entity is using that exact registered name — nothing more. It does not mean you own the name or have the right to use it as a brand.

The two are separate systems

• Entity name availability (what Delaware checks) is about whether the name is free to register as a business entity in Delaware
• Trademark rights are a separate body of law governing brand names across the country, based on use and federal or state registration

A name can be available in Delaware while another company already holds a federal trademark on it — in which case using it as your brand could expose you to an infringement claim, regardless of your Delaware filing. Conversely, a name taken as a Delaware entity might still leave trademark room in a different field.

Do both checks

Before you build a brand around a name, search the US Patent and Trademark Office database (TESS) in addition to Delaware's entity search, and ideally check common-law use — general web and business-name searches. If the brand matters, a trademark attorney's clearance search is worth the cost. Delaware availability gets you a legal entity name; trademark clearance protects the brand you'll actually market under.