For punctuation purposes, traditionally, Jr. or Sr. was set off from the rest of the name with a comma. However, in recent years the comma has often been dropped.
- John Doe, Sr.
- John Doe, Jr.
- John Doe Sr.
- John Doe Jr.
Alternatively, the younger one could be given a number, usually a Roman numeral, after the name. The Roman numeral does NOT follow a comma.
- John Doe II
- John Doe III
Royalty and popes are usually referred to by their first name followed by a Roman numeral.
Roman Catholic Popes
- Henry VIII
- George II
- Edward VIII
- Elizabeth II
- Innocent XII
- Pius XI
- Benedict XV
- John Paul I
Jr. for women
Traditionally, the younger was called a nickname until she married and took her husband’s last name. At that point, she would no longer have her mother’s name.
Examples (from straightdope.com)
- Anna Eleanor Roosevelt Jr. (only daughter of Anna Eleanor Roosevelt and Franklin Delano Roosevelt)
- Winifred Sackville Stoner Jr. (a child prodigy)
- Dorothy Fuldheim Jr. (professor at Case Western Reserve University)
- Carolina Herrera Jr. (designer of fragrances for her mother)