[D C[_2_]]

Don Pearce wrote:

There you lay your finger on the problem. The land naming conventions
of the day were subject to a strict protocol. What that meant was that
you could not name a new country for somebody's first name unless he
was a king, in which case you used his regnal name. If you were naming
for a commoner, you had to use his surname,giving - as you say -
Vespucciland. The fact that it is called America tells us that it was
named for a commoner whose surname was Americ. Which is exactly where
we are.

What is your source for this?