Where does “ippon” come from?

ippon (Dutch) comes from Japanese 一本, from Japanese 一, from Japanese 始め, from Japanese 始める — begin; start; initiate; originate.

ippon (Dutch): ippon

Definitions

Step	Language	Word	Meaning
1	Japanese	一本	one thing; Short for 一本勝ち .: winning in one blow;...
2	Japanese	一	one, 1; "term relating to the number one"; unity
3	Japanese	始め	beginning, the start of an activity or time...
4	Japanese	始める	begin; start; initiate; originate

ippon — Etymology, Origin & Word History | Etymology Explorer