https://www.nikkansports.com/battle/sumo/news/202506140001987.html
In explaining the official name of his new company (Hakuho Dayan Sumo & Sports Corporation (白鵬ダヤン相撲&スポーツ株式会社)), Hakuho claims descent from Dayan Khan.

https://en.wikipedia.org/wiki/Dayan_Khan