Family name Сию (Siju 
, Сию 
, Siiu 
) , globally, is quite a common surname. The surname Сию is characteristic of Western Asia, particularly Oman, where it is quite a rare surname, United Arab Emirates, and Bahrain. In absolute terms, it is the most numerous in India, Nigeria, and United Arab Emirates. More frequently, Сию is the forename as well as the last name.