Orthia \o-rthia, or-thia\ as a girl's name is of Greek origin, and the meaning of Orthia is "straight". From the word "orthos".
Baby names that sound like Orthia are Oretha, Artha, Artheia and Ertha. Other similar baby names are Orphia, Oria, Orelia, Oralia, Oracia, Orazia, Oratia, Orasia, Orania, Orphea, Orfia, Orinthia, Orenthia and Orphie.