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 is derived from medio-Latin "runcari," indicating deforestation. The village Dăbăcești on the Jaleș river (no longer present) mentioned in a document dated 3 October 1385 by Dan I was an ancestor of Runcu.