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Globally, Аку (Aku , Akes , Аку ) is a common dominantly masculine, but uncommonly girly given name. The first name Аку is habitual in Brunei, where it is quite a common gender-neutral name, Japan, where it is quite a common male name, and Finland, where it is quite a rare boy's name. Measured by absolute frequency, it is commonest in Japan, Indonesia, and Nigeria. Much less frequently, Аку is the last name as well as the forename.
Аку is also a name for the fictitious and mythical characters: Aku , the main antagonist of Samurai Jack.