A person may have two completely different names for the following reasons:
1. Binonymy: In some cultures, a person may have another name or alias , used for different occasions or purposes. For example, someone might have a formal name and an informal name, or a family name and a professional name. In this case, a person may use a different name to get along with family and friends, or use a different name in different social situations.
2. Name changes: Sometimes people change their names, perhaps due to marriage, adoption, legal custody, or personal preference. In this case, they may be given a new first or last name, or they may choose to keep their original name but a different last name.
3. Anonymity: Sometimes people choose to remain anonymous, such as using aliases or pseudonyms online or in certain settings. In this case, a person may have multiple names, depending on the occasion and purpose.
4. Name confusion: In some cases, a person's name may be confused or recorded incorrectly. For example, the wrong first or last name may appear in certain documents or records, or there may be confusion among relatives and friends. In this case, a person may use a different name to avoid confusion and errors.
In short, having two completely different names for a person does not necessarily mean there is anything unusual. It may just be the result of cultural habits, personal choices, or environmental factors.