Trademarks: The Confusingly Similar Test

Written By Asia Wright

Is Your Business Name Really Available? Understanding the "Confusingly Similar" Test

The Short Answer

A business name is "confusingly similar" to an existing trademark when customers would likely think the two businesses are connected. The USPTO calls this the likelihood of confusion test. It compares how the names look, sound, and feel, and how closely related the products or services are. An exact match is not required to fail the test, and a name that is available with your state can still infringe someone else's trademark.

 

You found the perfect name. The Texas Secretary of State says it's available. The domain is open. The Instagram handle is free. You're good to go, right?

 

Not necessarily.

 

One of the most common mistakes I see founders make is thinking that "available" means "safe." It doesn't. When the Texas Secretary of State approves your business name, it only means your name is distinguishable from other entity names already on file with the state. The Secretary of State does not check federal or state trademarks, assumed names, or businesses using a name without registering it. Texas law even says that forming your entity doesn't give you the right to use a name that violates someone else's trademark rights.

 

Whether someone else already has rights to a name like yours is a different question. That question is answered by understanding if there is a confusingly similar brand on the market, but especially, trademarked.

The Test Isn't "Is It the Same Name?"

Most people search for their exact name, see no results, and assume they're clear. But trademark law doesn't ask whether your name is identical to someone else's. It asks whether your name is confusingly similar: would an ordinary customer likely believe your business is connected to, or the same as, another business?

 

The USPTO formally calls this the likelihood of confusion test. Under Section 2(d) of the Trademark Act, examining attorneys use it to decide whether to approve or refuse your trademark application. Courts use a very similar multi-factor test when someone sues for trademark infringement.

What Makes Two Names "Confusingly Similar"?

There's no magic formula, and no "change 10% and you're fine" rule. The USPTO is clear that there is no mechanical test, and every case is decided on its own facts. The analysis looks at the overall picture. Here are the big factors.

 

1. How the names look, sound, and feel.

The USPTO compares the marks as a whole for appearance, sound, meaning, and overall commercial impression. Similarity in just one of these can be enough. If you say your name out loud and a customer couldn't tell it apart from another brand without seeing the spelling, that's a problem. Swapping one letter, using "Kwik" instead of "Quick," or writing "Lite" instead of "Light" usually won't save you.

 

2. What you're selling.

Think about Dove. Dove chocolate and Dove beauty products share the same name, are owned by different companies, and both coexist as protected trademarks. Why? Because most people don't think the chocolate company makes lotion, or that the lotion company makes chocolate.

 

But if Dove only made lotion and a new company launched Dove soap, that application would likely be refused. A customer could easily assume a lotion brand also makes soap. The goods don't have to be identical or even competing. They only need to be related enough that customers might assume they come from the same source. And the closer your products or services are, the less similar the names need to be before there's a problem.

 

One more thing: being in a different trademark class does not automatically mean you're in the clear. Classes are an administrative filing tool. What matters is whether customers would see the products as related.

 

3. The overall impression.

Imagine a coffee shop with a green circular logo, a smiling figure, and a name that feels a lot like Starbucks. Even if the name is different, a customer who isn't paying close attention might assume it's connected. The USPTO focuses on the general impression an average customer remembers, not a careful side-by-side comparison. That "borrowed" recognition is exactly what trademark law is designed to prevent. Logos, colors, and meaning all count, not just the letters.

 

4. How and where customers shop.

Quick, low-cost purchases like snacks, beverages, cosmetics, and apparel carry a higher risk of confusion because buyers don't stop to study the label. Expensive or specialized purchases tend to carry less risk because buyers pay closer attention. Selling through the same channels, like the same stores, websites, or marketplaces, also increases the risk.

 

5. How crowded the field is.

If many businesses already use similar names for similar products, customers are used to telling them apart, and each name gets narrower protection. A unique, made-up name owned by someone else carries much more risk than a common word.

A Real Example From My Practice

I once worked with a client who had been in business for years. Her product was about to go into a major retailer, so she came to me to file her trademark. Before filing, I ran a Comprehensive Name Availability Search, and I found another company with a name just one letter different, selling the exact same type of product.

 

She had thousands of packages sitting in a warehouse. The other company hadn't contacted her yet, but there's no guarantee a trademark owner will object right away because they don't have a deadline to report infringement. And the longer you build on a name that isn't yours, the more expensive a forced rebrand becomes.

 

A potential legal issue was scary, but the hardest part was letting go a name she truly loved. And all of it could have been avoided with one early search.

Why a State Name Search Isn't Enough

When the USPTO reviews your application, the examining attorney searches federal registrations and pending applications. But businesses using a name without any registration can still have "common law" rights from being first, and they can oppose your application or send you a cease-and-desist.

 

Here's what a real name clearance search should look at:

  • Federal trademark registrations and pending applications at the USPTO

  • Similar spellings, sound-alikes, and names with the same meaning

  • Related products and services, not just your exact industry

  • State business and trademark registries across the country

  • Businesses using the name without a registration

  • Websites, social media, and online marketplaces

 

A Secretary of State search checks only a small piece of this.

When Should You Check?

Before you form your LLC, order your packaging, print your signage, or spend money on branding. The earlier you clear your name, the cheaper it is to change course. A good rule of thumb: once you're attached to your name, or once a rebrand would be expensive, it's time to protect it.

Protect Your Name Before You Build On It

If you're launching a new business or thinking about trademarking your brand, start with a comprehensive name availability search. I'll search for exact matches and confusingly similar names, then give you a clear read on your risk before you invest another dollar in your brand.

 

Order your Name Availability Search here or book a Founder Protection Call to talk through your options.

 

This post is for general educational purposes and isn't legal advice. Every name is different, so talk with an attorney about your specific situation.