Where does “Tîrnăvean” come from?

Tîrnăvean (Romanian) comes from Romanian -ean, from Proto-Slavic -ěninъ.

Ancestry of “Tîrnăvean”, step by step

Step	Language	Word	Meaning
1	Romanian	-ean	Forms adjectives and nouns indicating origin or...
2	Proto-Slavic	-ěninъ	—