- < Proto Hind-Ewropaki *dwo ("di")
- Arikiyo Kehan *dva ("di")
- Zazaki: di
- Ewıstki: dva ("di")
- Pehlewki: dō ("di")
- Farski: do ("di")
- Belucki: do ("di") (< Farski ra)
- Kurmancki: du ("di") (< Farski ra)
- Goranki: dwe ("di")
- Sanskritki: dvá ("di")
- Yunanki: duo ("di")
- Latinki: duos ("di")
- Almanki: zwei ("di")
- İngılızki two ("di")
- 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.
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