What is Xu's English name?

Hello, because in passport translation, most people spell the name "Meng Han" together at present, so the common formal translation is:

Xu,

However, in some places, the translation still separates the names of two words, so it will be: Xu,

In other words, the English name translation of "Xu" is the same as that of Chinese Pinyin:

Xu, (in English writing only, when the surname is written before the first name, a comma is used to distinguish it)

Generally speaking, when introducing themselves in English, most people say their first name before their surname Xu:

Xu (first name is written before last name, no comma)