Oda should answer an SBS question on that tbh and give nationalities to more side characters in the story.

Big Mom: German, French?
Garp: Scottish if we go by OPLA
Kaido: Mongolian
Sengoku: Nepal
Shanks: Irish?
Rayleigh: English
Roger: Portuguese?
Whitebeard: English
Xebec: Dutch

Admirals would probably all be Japanese since their design is based off the actors.
What if they are mixed, multinational or dual-citizenship characters?
 
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