Your name must be unique, and not deceptively similar, to any other trademarked name or business. It is also required that your name not be used to intentionally misrepresent the products or services you offer. For LLCs, nearly all states will also require you to add a signifier of your limited liability status, such as "LLC" or "L.L.C." to the end of your company's name. You may be able to operate under a name other than your formal LLC name by applying for and using a dba.
Washington "corporation", "incorporated", "company", or "limited", or the abbreviation "corp.", "inc.", "co.", or "ltd."; must not include "Bank", "banking", "banker", "trust", "cooperative", or any combination of the words "industrial" and "loan", or any combination of any two or more of the words "building", "savings", "loan", "home", "association", and "society" § 23B.04.010 Revised Code of Washington
Sole Proprietorship – A sole proprietorship, also known as a trader firm or proprietorship, is a business firm that is owned and run by one individual. A sole proprietor may use a trade name or business name other than his or her name. Registration not required – In summary, biggest advantage is quick formation and low compliance. However, the biggest disadvantage is unlimited liability.
LLC, LC, Ltd. Co., Limited Liability Company: a form of business whose owners enjoy limited liability, but which is not a corporation. Allowable abbreviations vary by state. Note that in some states Ltd. by itself is not a valid abbreviation for an LLC, because in some states (e.g. Texas), it may denote a corporation instead. See also Series LLC. For U.S. federal tax purposes, in general, an LLC with two or more members is treated as a partnership, and an LLC with one member is treated as a sole proprietorship.
Maine words or abbreviations of words that describe the nature of the entity, including "professional association", "corporation", "company", "incorporated", "chartered", "limited", "limited partnership", "limited liability company", "professional limited liability company", "limited liability partnership", "registered limited liability partnership", "service corporation" or "professional corporation"; beginning July 1, 2007, may also include "limited liability limited partnership" for business corporations: Title 13-C § 401 Maine Revised Statutes; for non-profit corporations: Title 13-B § 301-A Maine Revised Statutes
Unlike in many other Western countries, Canadian businesses generally only have one form of incorporation available. Unlimited liability corporations can be formed in Alberta "AULC", British Columbia "BCULC" and Nova Scotia "NSULC". The aforementioned unlimited liability corporations are generally not used as operating business structures, but are instead used to create favorable tax positions for either Americans investing in Canada or vice versa. For U.S. tax purposes the ULC is classified as a disregarded entity.