Family name Saeko (Saeko 
, サエコ , さえこ) , across the world, is a common cognomen. The cognomen Saeko is habitual in Japan, where it is quite a common surname, Thailand, where it is a rare surname, and Egypt, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Japan, Thailand, and Indonesia. Much less frequently, Saeko is the forename as well as the last name.