Cognomen Ployphan (พลอยพรรณ 
, Ployphan ) , throughout the world, is an extremely rare family name. The family name Ployphan is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Predominantly, Ployphan is the forename as well as the last name.
Marrat, Koonprasitporn, Chansawang, Singharach, Satayarakvit, Janthanudej, Griffiths, Phornnopphasinwongsa, Pravahanavin, Nipayaporn, Narajorn, Jarupeng, Ruenjinda, Ploytubtim, Chumchua, Klongklaew, Sornsuwit, Luadthong, Dusiyamee, Raktham, Pootawan, Khuwibunsin, Khuwiboonsin, Kasunan, Chumnum, Swangviboonpong, Laudthong, Rujtikumporn, Kulluk, Kullak, Srisan, Meelongloi, and Boonprasertwattana