- Proto-Hind-Ewropaki ra *swep- ("hewn kewtene") > *swep-no- ("hewn")
- Proto-Aryaki ra
- Ewıstki: xvafna- ("hewn")
- Pehlewki: xwamm- ("hewn")
- Soğdki: ‘wbnw ("hewn")
- Hotenki: hūna ("hewn")
- Farski: xvāb ("hewn")
- Kurmancki: xawn ("hewn")
- Osetki: fun ("hewn") ...
- (Zazaki: hawn) Alfabeyê Ariki († wewn)
- Sanskritki: svápna- ("hewn")
- Yunanki: hypnos ("hewn")
- Latinki: somnus ("hewn"), somnium ("hewn")
- Horn, Paul. Dictionary of Persian Etymology (Strassburg, 1893),
- Watkins, Calvert. The American Heritage Dictionary of Indo-European Roots, 2nd ed., Houghton Mifflin Co., 2007. *Amazon.com ra,
- Etymonline. Online English Etymology Dictionary. <etymonline.com> by Douglas Harper.,
- Julius Pokorny's Indo-European Etymological Dictionary
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