Jr., Sr., III

Q. If names are listed last name first and first name last, after which name does the suffix (Jr., Sr., III, etc.) follow? How is this formatted?

A. Commas, even when not used with the noninverted form, are always used with inverted names, which should appear in the following order:

Surname, Given Name, III
Deer, Jim G., Sr.

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]