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Last name Dilhan (Dilhan , Дильхан ) , in all the world, is quite a common cognomen. The last name Dilhan is characteristic of Sri Lanka, where it is quite a common surname, Qatar, where it is a rare surname, and United Arab Emirates. Measured by absolute frequency, it most frequently occurs in Sri Lanka, France, and United Arab Emirates. Likewise, Dilhan is the forename as well as the last name.