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Family name Lillya (Lillya , Лилля ) , all around the world, is a very rare last name. The last name Lillya is characteristic of Algeria, where it is a rare surname, the United States, where it is an extremely rare surname, and the United Kingdom. Measured by absolute frequency, it is commonest in Algeria, the United States, and India. Likewise, Lillya is the forename as well as the last name.