Where does “yo” come from?

yo (Old Leonese) comes from Vulgar Latin eo, from Latin egō, from Proto-Italic egō, from Proto-Indo-European éǵh₂ — I.

Ancestry of “yo”, step by step

StepLanguageWordMeaning
1Vulgar LatineoI go, I move; I advance, I proceed, I progress; I...
2LatinegōI; first person singular personal pronoun, nominative case
3Proto-ItalicegōI
4Proto-Indo-Europeanéǵh₂I
Every word from Proto-Indo-European éǵh₂ →Every word from Proto-Italic egō →Every word from Latin egō →