Rivalen is the name of the father of Tristan in Arthurian legend (in some versions his father is Meliodas). The origin of the name seems to be a medieval form of Rhiwallon, the Welsh form of Brythonic *Rigovellaunos made up from Proto-Brythonic *riɣ (king) via Proto-Celtic *rīxs (king) derived from a PIE root word; and *vellauno meaning “chief, leader, ruler” so the name essentially means “king of rulers” or “chief king”. Rivalen is also a German and Dutch word plural word meaning “rivals”.
- Rhiwallon (Welsh)
- Rivallo (English)
- Rigovellaunos (Brythonic, Old Celtic)