"WAIDOU"
But on a serious note, Kaido's own name has a "W" in it:
What does Kaido mean in Japanese? The kanji Kaido (快童/怪童) means "joy boy /strong kid". This is a popular theory spreading in JP fandom. Not that Kaido himself is Joy Boy, but maybe his parents gave him the name Kaido, hoping he'll become someone like Joy Boy.
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