Where does “orthie” come from?

orthie (Old French) comes from Latin urtīca, from Latin -āria, from Latin -ārius, from Proto-Italic *-āzios.

Ancestry of “orthie”, step by step

Step	Language	Word	Meaning
1	Latin	urtīca	—
2	Latin	-āria	—
3	Latin	-ārius	—
4	Proto-Italic	*-āzios	—