Where does “-awr” come from?

-awr (Welsh) comes from Proto-Brythonic *-ọr, from Latin -ārius, from Proto-Italic *-āzios.

Ancestry of “-awr”, step by step

Step	Language	Word	Meaning
1	Proto-Brythonic	*-ọr	—
2	Latin	-ārius	—
3	Proto-Italic	*-āzios	—