The Rižana was attested in historical sources as Rusano c. 670, Riziano c. 804, Risano in 1135, and Garzignana in 1569, among other spellings. The origin of the name is pre-Slavic and is probably related to the Illyrian toponym Ῥιζάνα Rhizana, reflected in the Montenegrin toponym Risan. The name is probably derived from the Proto-Indo-European root *erei̯H- 'to flow'.[2]
^Snoj, Marko (2009). Etimološki slovar slovenskih zemljepisnih imen. Ljubljana: Modrijan. p. 356.
Further reading
Blažević, Marija (1986). "Istarske rijeke" [Istrian Rivers]. Priroda: popularni časopis hrvatskog prirodoslovnog društva. Vol. 72, no. 8. pp. 228–231. ISSN0351-0662.