All I can tell you is the the Rudareanu is a commun name in Oltenia- Dolj. I was born there and the village is RAST.
All this people left Romania because of the war and because of the creation of Big Romanai on dec. 1, 1918. Most likely other relatives were not able to join them later on here.
Romania's economical situation startd to be better after 1920 and peoplae were not motivated to leave anymore.
Rudar means in Oltenia Gypsy.