Where does “ぶん” come from?

ぶん (Middle Chinese) comes from Japanese ぶち, from Japanese ぶつ, from Middle Chinese 佛, from Pali Buddha, from Sanskrit बुद्ध, from Proto-Indo-Aryan buddʰás, from Proto-Indo-Iranian bʰudᶻdʰás, from Proto-Indo-European bʰudʰtós — to be awake, be aware.

Ancestry of “ぶん”, step by step

StepLanguageWordMeaning
1Japaneseぶちvery
2Japaneseぶつ
3Middle Chinese
4PaliBuddhaBuddha, the enlightened one
5Sanskritबुद्धawake; enlightened, conscious, intelligent,...
6Proto-Indo-Aryanbuddʰás
7Proto-Indo-Iranianbʰudᶻdʰásaware, awake
8Proto-Indo-Europeanbʰudʰtósaware
9Proto-Indo-Europeanbʰewdʰ-to be awake, be aware
Every word from Proto-Indo-European bʰewdʰ-Every word from Proto-Indo-European bʰudʰtósEvery word from Proto-Indo-Iranian bʰudᶻdʰás