- Proto-Hindo-Ewropayi ra *leuk- ("vırsayene, roşn dayene")
- Proto-Aryayi ra *rauč- ("vırsayene")
- Ewıstki: raocana- ("--hole in wall for letting light in--")
- Farski: rauzan ("--hole in wall for letting light in--")
- (Zazaki: locana) Alfabeyê Ariki
- Schwartz, Martin. Iranian *L, and Some Persian and Zaza Etymologies. Iran and the Caucasus, Volume 12, Number 2, 2008 , pp. 281-287(7), Publisher: BRILL [1].,
- Julius Pokorny's Indo-European Etymological Dictionary
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