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In the world, Aku (Aku , アク , Аку ) is a common mostly male, but infrequently female forename. The forename Aku is characteristic of Brunei, where it is quite a common unisex name, Japan, where it is quite a common male name, and Finland, where it is quite a rare male name. In absolute terms, it is commonest in Japan, Indonesia, and Nigeria. Very seldom, Aku is the last name as well as the forename.
Aku is also a name for the fictitious and mythical characters: Aku , the main antagonist of Samurai Jack.