From Proto-Indo-European *h₁su-.
*Hsu-
- good
- Proto-Indo-Aryan: *Hsu-
- Proto-Iranian: *Hhu-
- Central Iranian:
- Northeastern Iranian:
- Khotanese: 𑀳𑀼- (hu- /hu-/)
- Sogdo-Bactrian:
- Bactrian: υο- (uo- /ho-/)
- Sogdian: (/(ə)xwa- ~ (ə)xu-/)
- Sogdian script: [script needed] (ʾγw), [script needed] (γw)
- Manichaean script: 𐫟𐫇- (xw-)
- Syriac script: ܐݎܘ- (ʾxw-), ݎܘ- (xw-)
- Northwestern Iranian:
- Parthian: (/hu-/)
- Manichaean script: 𐫍𐫇- (hw-)
- Inscriptional Parthian script: 𐭇𐭅- (ḥw-)
- → Old Armenian: հ- (h-) (or inherited and contaminated with the Iranian)
- Kurdish: ho- (as in hogir, hokar, horî, etc.)
- Southwestern Iranian:
- Old Persian: 𐎢- (u- /<h>u-/)
- Middle Persian: (/hu-/)
- Manichaean script: 𐫍𐫇- (hw-)
- Book Pahlavi script: [Book Pahlavi needed] (hw-)
- Inscriptional Pahlavi script: 𐭧𐭥- (ḥw-)
- Psalter Pahlavi script: 𐮄𐮅- (hw-)
- Pazend script: 𐬵𐬎- (hu-)
- Classical Persian: هوـ (hū-), هـ (hu-), خـ (xu-)
- Iranian Persian: هوـ (hū-) (revived prefix as "eu-")