characters referred by surname?
Here are examples I remember
Monkey D. Luffy: called 'Monkey-chan' by Shakky
Roronoa Zoro: many times referred as Roronoa
Trafalgar Law: also referred Trafalgar
Scratchmen Apoo: Kid called him Scratchmen
Eustass Kid: I don't remember when he was called Eustass but he definitely was called that.
Rocks D. Xebec: People just call him Rocks.
Any other examples? I tried putting Caesar Clown but it seems his name is Caesar.
(Boa Hancock is called Hancock not Boa goddamn english speakers.)