Cognomen น้องสาว (Sisy 
, Ssis 
, Sisser 
) , around the world, is quite a rare last name. The cognomen น้องสาว is habitual in Egypt, where it is a rare surname, Kuwait, and Algeria. Not in comparison with a country's population, it is commonest in Egypt, Indonesia, and Algeria. Also, น้องสาว is the forename as well as the last name.