Where does “Rahovan” come from?

Rahovan (Romanian) comes from Romanian Rahova, from Bulgarian Оряхово, from Old East Slavic орѣхъ, from Proto-Slavic orěxъ, from Proto-Indo-European areyis-.

Ancestry of “Rahovan”, step by step

Step	Language	Word	Meaning
1	Romanian	Rahova	—
2	Bulgarian	Оряхово	—
3	Old East Slavic	орѣхъ	—
4	Proto-Slavic	orěxъ	nut; walnut
5	Proto-Indo-European	areyis-	—

Every word from Proto-Indo-European areyis- →Every word from Proto-Slavic orěxъ →Every word from Old East Slavic орѣхъ →