Cognomen Siwakon (ศิวกร 
, ศิวากร , Siwakon 
) , worldwide, is a very rare surname. The last name Siwakon is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more frequently, Siwakon is the forename as well as the last name.
Esor, Chenchob, Pathummsout, Pourpunsawat, Phithong, Sawangsri, Songlaead, Kaewphaka, Kaweedamromgphatthan, Pugpoonsup, Jintajitt, Ngamjarat, Siritrakool, Sirichusap, Sritunyarat, Kanthapong, Kaweedamrongphatthan, Phueakthara, Phromthong, Thongphoon, Thongyodkaew, Suwanpakdee, Chatkanchana, Sriwicha, Suppalap, Sitthino, Banlu, Meesad, Muekthong, Khamai, Pattha, Onthao, Yodsuk, Mekarun, Sangyai, Saisaat, Songkhramyod, Saevang, Boonrot, Khotwit, Pengwan, Pokkhrong, Phetnoi, Rommueang, Jankong, Thepriya, Nilphet, Sariphat, Sriphet, and Charoenchai