By Moldovans I mean people of the current country of Moldova and Moldavians, from the historical region which is now also part of Romania.

The Mongols founded a country called "The Golden Horde" around Moldova, so don't Moldovans have Mongol blood in them?

I know Wallachia is made up of Thracians and Illyrians.

Transylvania is said to be populated by Dacians who were later Romanized but that is disputed, last I read somewhere.

People from the country of present-day Hungary are mostly descended from Slavs and Avars. The Hun connection is most prominent in the Szekelys, not in today's Hungary last time I read.