Cognomen Suwijak (สุวิจักขณ์ 
, Suwijak ) , in the entire world, is a very rare last name. The cognomen Suwijak is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more frequently, Suwijak is the forename as well as the last name.
Apai, Janthaithacha, Thongjan, Tongngarm, Wongsajja, Suphanpong, Srichinnawinit, Chandaphan, Kaewniramit, Thitiwinit, Thongsanit, Thongthep, Mongkalakorn, Sangkasanee, Saengkasanee, Prasertwong, Prasitwanakul, Thepwichian, Muangkasemsan, Boonmarueng, Leeprasertporn, Suwannakeeta, Rimphongoen, Raksanak, Kudsongkram, Srisuwan, Sridam, Bunmee, Plysin, Dokbua, Jaemwanna, Tamdon, Bangrak, Palasak, Pradsin, Poonnuwong, Srisuwannaket, Phaedet, Phetamonwong, Dhamtaveepoj, Gaewgoon, Labasee, Jianjit, Tiyawat, Namwong, Samattha, Sukkatorn, Sompalachaiya, Phongam, and Buranapaisarnkul