Where does “Ternăvean” come from?

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

Ancestry of “Ternăvean”, step by step

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