The name Runcu derives from medio-Latin "runcari" which means to deforest. A village on the Jaleș river named Dăbăcești (now disappeared) mentioned in a document of Dan I dated 3 Octombrie 1385 was the precursor of Runcu.
The name Runcu comes from medio-Latin "runcari," meaning deforestation. The village on the Jaleș river named Dăbăcești (no longer extant) appears in a document dated October 3, 1385, by Dan I, and it was an ancestor of Runcu.