The antonyms for the phrase "assumed names" are "real names," "legal names," or "given names." These terms refer to the names that an individual is legally recognized by and registered with a government authority. Unlike assumed names, real names are typically used for official and legal purposes such as identification, employment, taxes, or banking. While an assumed name might be used as a pseudonym or stage name for various reasons, including privacy, anonymity, or creativity, it cannot replace a person's true identity. Therefore, knowing the distinction between assumed names and real names is essential for maintaining one's legal and social credibility.