Cognomen Sittichai (สิทธิชัย , Sittichai , สิทธิไชย ) , in the world, is quite a common surname. The cognomen Sittichai is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname. More frequently, Sittichai is the forename as well as the last name.
Pho, Pinyakong, Pusakulsuk, Jandaeng, Tayanuwat, Thaiking, Thummabenchanukit, Wannarin, Wirojanupatump, Yuttrakul, Maytayapirom, Sumpitaksakul, Chaichana, Chungchiranon, Promthong, Vanissanee, Khanongnuch, Tangchokprasert, Thiengmanee, Wongtongdee, Limpananakthong, Sereesongsaeng, Kwankaew, Klinsuebchua, Kraisaeng, Khunpaichit, Saard, Tacha, Saelim, Aomsub, Buajoy, Phuket, Luwerthong, Thanee, Thaway, Tupbumrung, Chaichanasuwat, Metaaphanon, Suthasri, Chaisit, Cheepborisut, Kullang, Kinyaem, Klajing, Phonwat, Theamhirunsopit, Netjaru, Chaiphan, Siriyuenyong, and Rattanawongsiri