Cognomen سايكي (Saiki 
, Sajiki 
, Saeki 
) , around the globe, is a common last name. The surname سايكي is characteristic of Japan, where it is quite a rare surname, Hong Kong, and Bahrain. Measured by absolute frequency, it is the most numerous in Japan, Brazil, and the United States. Much less frequently, سايكي is the forename as well as the last name.