Where does “オクタスロン” come from?

オクタスロン (Japanese) comes from English octathlon, from English -athlon, from Ancient Greek ἆθλον, from Proto-Indo-European h₂weh₁- — to blow.

Ancestry of “オクタスロン”, step by step

StepLanguageWordMeaning
1EnglishoctathlonA sporting event consisting of eight different sports or contests
2English-athlonContest
3Ancient Greekἆθλονprize of a contest; contest; place of combat,...
4Proto-Indo-Europeanh₂weh₁-to blow
Every word from Proto-Indo-European h₂weh₁- →Every word from Ancient Greek ἆθλον →Every word from English -athlon →
オクタスロン — Etymology, Origin & Word History | Etymology Explorer