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Around the world, Саю (Sayu , Саю ) is quite a rare mostly female, but infrequently masculine first name. The first name Саю is characteristic of Indonesia, where it is quite a rare primarily female, but very seldom masculine name, Singapore, where it is a rare female name, and Ethiopia. In absolute terms, it is the most numerous in Indonesia, India, and Ethiopia. Much less frequently, Саю is the last name as well as the forename.
Саю is also a name for the fictitious and mythical characters: Sayu , the musical character in the musical Death Note: The Musical.