Cognomen Siay (Siay 
) , all over the world, is quite a rare last name. The last name Siay is characteristic of Tanzania, where it is quite a rare surname, Philippines, where it is a rare surname, and Malaysia, where it is a very rare surname. Very seldom, Siay is the forename as well as the last name.
Ms, James, Jesca, Julie, Junie, Ester, Endan, Vilma, Irene, Salome, Samwel, Sabina, Safari, Sophia, Armaya, Ashbel, Penado, Rogath, Rowena, Linaflor, Jasmin, Jenive, Lucia, Editha, Lorna, Glory, Kay, Rey, Noe, Muna, Alma, Anna, Liza, Lyka, Noel, Ejay, Yumi, Mateo, Magay, Mercy, Minda, Anita, Chona, Peter, Ronel, Ricky, Ritha, Lidia, and Wilson