Why does a person have two completely different names? Last names are all different.

A person may have two completely different names for the following reasons:

1. Binominal system: In some cultures, a person may have another name or alias for different occasions or purposes. For example, some people may have a formal name and an informal name, or a surname and a professional name. In this case, a person may use different names to get along with family and friends, or use different names in different social occasions.

2. Renaming: Sometimes people change their names, which may be because of marriage, adoption, legal dependence or personal preference. In this case, they may get a new name or surname, or choose to use the original name but a different surname.

3. Anonymity: Sometimes people choose to remain anonymous, such as using aliases or aliases online or in some cases. In this case, a person may have multiple names, depending on different occasions and purposes.

4. Name confusion: In some cases, a person's name may be confused or recorded incorrectly. For example, there are wrong names or surnames in some documents or records, or there are confused names between relatives and friends. In this case, a person may use different names to avoid confusion and mistakes.

In short, having two completely different names doesn't necessarily mean anything unusual. It may just be the result of a cultural habit, personal choice or environmental factors.