O Henry
A name that starts with an "R" and ends with an "O" could be "Rico." Other possibilities include "Rocco" or "Reno."
Orbit
owen
ozone
Orangutan.
Ontario
O Henry. however, this was just his pen name that he was known by.
There is no animal that has a long o at the beginning.
Oscar
Olive.
0bama
Orc