Cognomen Sadaia (Sadaia 
, Садая 
) , around the globe, is a very rare surname. The cognomen Sadaia is characteristic of Georgia, where it is a rare surname, Philippines, where it is an extremely rare surname, and Russia. Not in comparison with a country's population, it is the most numerous in Georgia, India, and Philippines. More prevalently, Sadaia is the forename as well as the last name.