In the case of doctorates, normally either the prefix (e.g. "Dr." or "Atty.") or the suffix (e.g. "J.D.", "M.D.", "D.O.", "D.C.", or "Ph.D.") is used, but both can be used at the same time due to preferences of different countries.
Likewise, what is a name suffix?
The suffix is an explanation of the first name, not the last. " John Doe Jr." means he is John, the son of John. In a full name listing, the suffix follows the last name because the person is primarily known by is given name and surname, the suffix being a secondary piece of information.
What is the prefix Mr?
Mr. Mister, usually written in its abbreviated form Mr. (US) or Mr (UK), is a commonly used English honorific for men under the rank of knighthood. The title derived from earlier forms of master, as the equivalent female titles Mrs, Miss, and Ms all derived from earlier forms of mistress.