Where does “ɸo” come from?

ɸo (Proto-Celtic) comes from Proto-Indo-European h₂pó, from Proto-Indo-European h₂epo — from, off, back; off, away; off, from.

Ancestry of “ɸo”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeanh₂póoff, away
2Proto-Indo-Europeanh₂epofrom, off, back; off, away; off, from
Every word from Proto-Indo-European h₂epoEvery word from Proto-Indo-European h₂pó