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Surname Tehan (Tehan , Техан ) , throughout the world, is quite a rare last name. The family name Tehan is characteristic of the Republic of the Congo, where it is quite a rare surname, Australia, and Sri Lanka, where it is a rare surname. Not in comparison with a country's population, it is commonest in the United States, Australia, and Sri Lanka. Likewise, Tehan is the forename as well as the last name.