It's called the suffix, and is more a title than a part of a name.
This is usually the last part of someone's name, where applicable; such as: II, III, Jr, Sr
The 3rd. (First name Last name III)
In speaking, simply address them by name- either first or last, depending on your relationship to them. The Jr. or III is mainly used in writing.
When "Jr" or "Sr" follows a last name, it is called a suffix or a generational suffix. It is used to indicate that a person has the same name as their father or grandfather respectively.
Title: "Mr", or "Mrs" or "Dr. Given Name: "John" or "James" or "Mary" Surname: "Jones" or "Smith" Suffix: "Jr", or "Sr" or "III"
Gaspar Hernandez III's birth name is Gaspar Hernandez Jr..
My guess would be something like this: Smith, John Jr.
Jonothano Knoxoviliusatus Jr. III
Carl Van Housserberger III Jr.
"Jr." is typically placed at the end of a person's name to indicate they are the son of another person with the same name. For example, if a father is named John Smith and his son is also named John, the son would be referred to as John Smith Jr.
First Name Middle Initial Last Name comma Jr. is the correct way.
When using last name first, Jr. is placed at the end of the full name. For example, Smith, John Jr.