Oro
Oroch
'Ôrôê
Oroha
Orok
Orokaiva
Oroko
Orokolo
Oromo
Oromo, Borana-Arsi-Guji
Oromo, Eastern
Oromo, West Central
Oroqen
Orowe
Oro Win
Oruma
Orya
Osage
Osatu
Oscan
Osing
Ososo
Ossetian
Ossetic
Ossetic, Old
Otank
Ot Danum
Oti
Otomi, Eastern Highland
Otomi, Estado de México
Otomi, Ixtenco
Otomi, Mezquital
Otomi, Querétaro
Otomi, Temoaya
Otomi, Tenango
Otomi, Texcatepec
Otomi, Tilapa
Otoro
Ottawa
Otuho
Otuke
Ouma
Oune
Övdalian
Owa
Owenia
Owiniga
Oy
Oya'oya
Oyda
ISO 639-3 Inverted Names