A man named after the junior is?

Answer 1

Junior and Senior are temporary designations intended to distinguish the younger from the older person with the same name in a family or small group. There is no third designation. When the Senior dies, the Junior can drop that designation, or can become Senior if a new person enters the group who also carries that name - and is then the Junior.

Calling someone the First, the Second, the Third, etc. is a separate system in which the numbers are permanent.

Suppose you have John I and his son, John II. If John II has a son named John, he is John III. And the same for John IV, John V, John VI, and so on.

Now, suppose John I and John II have died. John III is a middle-aged man with a son who is John IV. John III could also be called John, Sr., and his son John, Jr. But when John Sr., dies, John IV (Jr) becomes John, Sr., and his son can become John, Jr.

This is why families that have a long tradition of naming children the same more often use the numbering system exclusively and do not bother with Junior and Senior designations.