Proto-Indo-European *gʷʰren-

→ Catalan ronyó (inherited)

→ Spanish riñón (inherited)

→ French rein (inherited)

→ Ancient Greek φρήν (root)

→ Ancient Greek φρήν (derived)

→ Ancient Greek ὑπέρφρων (root)

→ Ancient Greek φρονέω (root)

→ Ancient Greek ἄφρων (root)

→ Ancient Greek -φρων (root)

→ Ancient Greek εὐφρονέων (root)

→ Ancient Greek λαθίφρων (mention)

→ Italian rene (inherited)

→ Latin ren (inherited)

→ Occitan ren (inherited)

→ Portuguese rim (inherited)

→ Romanian rână (inherited)