Cognomen Wirach (Wirach 
) , around the world, is a very rare last name. The cognomen Wirach is habitual in Canada, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Predominantly, Wirach is the forename as well as the last name.
Lalun, Jitwarawong, Thanawut, Hlongphimai, Olarikdech, Kaewmuang, Kulpetchprasithi, Kraisamire, Pracharktam, Lakkanasuwan, Luangkaew, Taweepreda, Thanomsub, Hiruntara, Amonpattana, Assawasuksant, Chitsamankhun, Leelakiatiwong, Luangwiraiwan, Jaroonkaiamonchai, Winitwatanawong, Winitwatawong, Jumpatach, Pimpanit, Prommasa, Panthong, Onkot, Samrae, Sumran, Paotajai, Satiman, Srichai, Auesongtham, Chudintra, Kaewrat, Kaeyiwha, Bancherdpongchai, Kongnet, Prommee, Tiewsuratkul, Nongrom, Huaykaew, Maneewan, Sanguria, Srisawat, Chouykun, Kamonsil, Kuanphet, Klayjeen, and Leelasupakij