Where does “-ar” come from?

-ar (Proto-Brythonic) comes from Proto-Celtic -aros, from Proto-Celtic -a-.

Ancestry of “-ar”, step by step

StepLanguageWordMeaning
1Proto-Celtic-arosForms collective nouns
2Proto-Celtic-a-—

Words derived from “-ar”

Every word from Proto-Celtic -a- →Every word from Proto-Celtic -aros →