How to register a business name in NH
If the business you plan to start will be named anything other than your own name, you must register it with the New Hampshire Secretary of State. If you are doing business under your own name, registration is not required, but is desirable. Registration helps identify who is operating a particular business. Register the business name early, before spending money on marketing materials!
Before registering your business, you need to decide what type of business to form. (See Choosing the legal form of your business.)
2) Register the name you want at NH Quickstart.
Or, you can also register in person at the Secretary of State’s office in Concord, New Hampshire.