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Family name Castiella (Ketela , Castiella , Castile ) , throughout the world, is quite a rare last name. The cognomen Castiella is habitual in Israel, where it is quite a rare surname, Finland, where it is a rare surname, and Uruguay. Measured by absolute frequency, it is commonest in the United States, Israel, and Ethiopia. Likewise, Castiella is the forename as well as the last name.