Noun
(law) a name under which a corporation conducts business that is not the legal name of the corporation as shown in its articles of incorporation
Source: WordNetPersons in trade had better be very cautious how they add a fictitious name to their firm, for the purpose of gaining credit. Edward Law, 1st Baron Ellenborough
Anger deposited the films at Schaefer's Camera Store in San Francisco, using the fictitious name of "Jackson" and giving a false address. Source: Internet
It is also known as a ‘doing business as’ (DBA) name, assumed name, or fictitious name. Source: Internet