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Around the world, アク (Aku , アク ) is a common mostly boy's, but infrequently girly first name. The forename アク is characteristic of Brunei, where it is quite a common gender-neutral name, Japan, where it is quite a common boy's name, and Finland, where it is quite a rare male name. Measured by absolute frequency, it is commonest in Japan, Indonesia, and Nigeria. Much less frequently, アク is the last name as well as the forename.
アク is also a name for the fictitious and mythical characters: Aku , the main antagonist of Samurai Jack.