William and Bill belong to the category of names in traditional English habits, and Bill belongs to William's nickname in traditional English.
Therefore, the spelling of "William Bill" is quite unnatural and very reluctant, and its performance in pure English countries is equivalent to "Zhang".
If China people want to have an English name, the structure can be divided into two parts, the name plus their own surname (generally there is no middle name). The spelling of surnames is the most normal in the local phonetic form. If an oriental has a western surname, it will cause misunderstanding. After all, in the English world, it is not normal to change one's surname. Often due to infant adoption, adoption and private servants. For example, many blacks in America today have white surnames.