Cognomen Rujikarn (Rujikarn 
) , worldwide, is an extremely rare last name. The family name Rujikarn is characteristic of Thailand, where it is an extremely rare surname, and the United States. Predominantly, Rujikarn is the forename as well as the last name.
Kumsi, Pruethiwongwanich, Pongjirawut, Pothavornjirakul, Pititaveetanawat, Roongsitmeteekul, Jindathepkarn, Mueansrichai, Sirikururatana, Siriruangnoppakun, Sumeteethaveewuth, Chotthitiwarasiri, Chotchinnakrit, Kaewjamras, Piyaphitakskul, Thamakhunpitak, Tungsongsawat, Yongwattanajiranon, Akarathanaapinan, Ruengsirapat, Jaroenpipitsakun, Veerapatcharanun, Kiatiwongchai, Kaewthong, Chompoosri, Chotthiwarasiri, Sripis, Kanrat, Talsom, Singlah, Senakong, Amsangiam, Phonhan, Komthatchakulnipad, Pitipassarapong, Phokhinamornphan, Sumeteetaveewuth, Pumnikom, Tnanapokarat, Hattakit, Hafainuea, Wangkarn, Sinthamrongpong, Srisaarddee, Sriarunsirisakul, Srijanpong, Chaisanam, Chatmetheeranan, Jaruwijitnan, and Thaweepatthanapong