There is no suffix of doe.
Alive or dead, John Doe III is always John Doe III. His widow can continue to be known as Mrs. John Doe III if she wants to be. Many women are known as Mrs. Mary Doe when their husbands are living and then would not likely adopt "Mrs John Doe" after his death. So in those cases, the Suffix is neither used nor retained.
A suffix is a group of letters attached to the end of a word to change its meaning or form. It is used to create new words, alter the grammatical function of a word, or to give a word a different tense or meaning.
The general rule is to place a comma after "PhD" when it is used as a suffix after a person's name (e.g., John Doe, PhD). However, if "PhD" is used in the middle of a sentence to describe someone's credentials, no comma is needed (e.g., John Doe has a PhD in Economics).
That would be called a Suffix. The Prefix would be Mr., Sir. etc.
A doe si doe is done in square dancing.
The suffix for undo is to not do.
the suffix is on
There is no suffix in misjudge.
doe, the male is a buck. A doe.
John Doe & Jane Doe
The suffix is -er, meaning "one who campaigns."
The suffix of radiation is -tion. This suffix means the process of.