- Proto-Hind-Ewropaki ra *per2- ("to go over, over") > *por+o- ("perre")
- Proto-Aryaki ra *pāra- / *pārya- ("perre, shore, opposite side, across"), *parn- ("perrayene")
- Ewıstki: pāra- ("shore"), parena- ("perre")
- Pehlewki: bār ("shore"), parr ("perre")
- Motuki: pāra ("sinor"), pārra ("perre")
- Soğdki: p'r ("sinor")
- Farski: bār ("shore"), parr ("perre")
- Kurmancki: per ("perre")
- Belucki: pāna ("perre")
- Peştunki: pōre ("perre")
- Osetki: par- ("perre")
- (Zazaki: parra) Alfabeyê Ariki
- Sanskritki: pāra- ("shore"), parnā- ("perre")
- Almanki: farn ("perre")
- İngılızki: fern ("perre")
- Yunanki: poros- ("way through, ford")
- 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,
- Julius Pokorny's Indo-European Etymological Dictionary
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