←
Proto-Celtic *awyos (inherited)
←
Proto-Celtic *aw (inherited)
←
Proto-Indo-European *h₂ew (inherited)
←
Primitive Irish ᚐᚃᚔ (inherited)
←
Old Irish aue (mention)
←
Old Irish awis (mention)
←
Old Armenian հաւ (mention)
→
Scottish Gaelic ogha (inherited)
→
Middle Irish ó (inherited)