Status: confirmed (payoff Ch. 909 — the Wano samurai arc lands) · Technique: name-etymology · world-building-seed · dual-language pun
The seed
A three-name cluster dropped almost incidentally inside the Thriller Bark zombie-general
fight — each name is an over-determined pun that telegraphs a setting Oda would not
deliver for hundreds of chapters.
The payoff
Earliest known caller
The Wa = Japan reading and the 竜馬/Sakamoto Ryōma link are long-standing fan-etymology staples,
called from the Thriller Bark zombie-general fight onward; specific earliest attribution unrecorded.
Why this matters
This is the same over-determination Oda uses for top-tier names (cf.
Mihawk Name Encodes Dracula Plus Hawk): a place + a person + an object
are each given Japan-coded names inside a throwaway villain fight, so the audience files an entire
future arc away as lore long before it is a destination.
incidentally-named land/character/weapon in late-Paradise chapters should spend a full etymology
budget — the New World’s marquee arcs are seeded here.