The antonyms for the term "fictitious business name" are many, and they include real, authentic, genuine, bona fide, legitimate, official, and actual. A fictitious business name is a bogus name that an individual or group uses for their business, rather than their own legal name. In contrast, authentic business names are directly related to the company owner's legal identity, and it must be registered with the government to avoid legal disputes. A bona fide business is one that operates legally, with no fraudulent or deceptive practices. In conclusion, the opposite of a fictitious business name is an authentic, legitimate, and official business name that reflects a company's legal status and identity.