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Family name Kilaj (Glass , Class , Glas ) , across the world, is a common cognomen. The last name Kilaj is habitual in Guernsey, where it is quite a common surname, Seychelles, and Puerto Rico (explore the name in all countries). Measured by absolute frequency, the name is most common in the United States, Germany, and the United Kingdom. Very seldom, Kilaj is the forename as well as the last name.