Where does “caeau” come from?

caeau (Welsh) comes from Welsh cae, from Middle Welsh kay, from Proto-Celtic kagyom, from Proto-Indo-European kagʰyóm, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “caeau”, step by step

StepLanguageWordMeaning
1Welshcaefield; third-person singular present...
2Middle Welshkayhedge; enclosure
3Proto-Celtickagyompen, enclosure
4Proto-Indo-Europeankagʰyómenclosure, hedge
5Proto-Indo-European-yósCreates adjectives from noun or verb stems
Every word from Proto-Indo-European -yós →Every word from Proto-Indo-European kagʰyóm →Every word from Proto-Celtic kagyom →