Where does “Bîrgoan” come from?

Bîrgoan (Romanian) comes from Romanian -an, from Latin -ānus — Of or pertaining to; -ian.

Ancestry of “Bîrgoan”, step by step

Step	Language	Word	Meaning
1	Romanian	-an	Added to nouns and adjectives as an augmentative...
2	Latin	-ānus	Of or pertaining to; -ian