How do I know English first and last names ... such as green? Is it a first name or a last name?

Specific analysis of the specific situation, for example, there are words like Mr. and Ms. in front, then it must be a surname. If it is ivy green, then the name comes first and the surname comes last. However, if the spelling is Green, Ivy, then the last name comes before the comma. Generally speaking, Green is a surname, not a first name.