Do I use a comma before Jr. and Sr.? What about names followed by roman numerals?

In the main text of your written work, use a suffix that is an essential part of the name—like Jr. or a roman numeral—when you cite a person’s name in full. Do not place a comma before numbered suffixes:

John D. Rockefeller IV

Place a comma before Jr. and Sr.:

Dale Earnhardt, Jr.

In a sentence, add a comma after Jr. or Sr. if words follow; the suffix is parenthetical:

Sammy Davis, Jr., was a member of the rat pack.

But see the MLA Handbook, section 2.1.2, on inverting such names in the list of works cited.

Published 23 August 2016

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