Surname 斯云 (Siyun 
, 斯云 ) , globally, is a rare cognomen. The cognomen 斯云 is habitual in South-eastern Asia, particularly Singapore, where it is a rare surname, Malaysia, where it is a very rare surname, and Indonesia. In absolute terms, the name is most common in China, Indonesia, and Singapore. Much more prevalently, 斯云 is the forename as well as the last name.