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Throughout the world, Siku (Siku , Siccus ) is quite a rare unisex given name. The forename Siku is habitual in Tanzania, where it is quite a rare gender-neutral name, India, where it is a rare gender-neutral name, and Saudi Arabia, where it is a very rare male name. In absolute terms, it is commonest in India, Tanzania, and Indonesia. Likewise, Siku is the last name as well as the forename.