He just didn't. Many people of the time (and even some now) did not have middle names.
Benjamin Franklin ... no middle name
Benjamin Franklin's full name was Benjamin Franklin. He had no middle name. Middle names were not common during that time.
"Benjamin Franklin had a middle name but everyone that knew it died." No. Benjamin Franklin had no middle name, as middle names were uncommon during the 1700s.
he has no middle name
benjiman franklins full name is Benjamin josiah Franklin.
Benjamin Franklin
William Benjamin Franklin
Benjamin Franklin, William Penn, Henry Hudson
Franklin! That's why they called him Benjamin Franklin.
Deborah Read Franklin
Benjamin Franklin wrote Poor Richard's Almanack.
Benjamin Franklin