Cognomen Sayfonh (Sayfonh 
) , in the world, is an extremely rare surname. Much more prevalently, Sayfonh is the forename as well as the last name.
Knox, Inthachack, Litthimane, Chitphanya, Heuangvilay, Sengchanh, Vorasane, Chanthasing, Vongvone, Toyphommalath, Phimvong, Sullivan, Sinouvong, Norvang, Moreno, Traymany, and Panyanouvong