Most English people have three names: a first name, a middle name and the family name. The family name comes last. For example, my full name is Jim Allan Green. Green is my family name. My parents gave me both of my other names.
People don't use their middle names very much. So "John Henry Brown" is usually called “John Brown”. People never use Mr., Mrs. or Miss before their first names. So you can say John Brown, or Mr. Brown; but you shouldn't say Mr. John. They use Mr., Mrs. or Miss with the family name but never with the first name.
It is different from Chinese names. In China, the first name is the family name, and the last name is the given name. For example, a man called Zhou Jian puts his family name Zhou first.