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Last name Guidar (Guide , Guiar , Guidar ) , in all the world, is quite a common family name. The cognomen Guidar is habitual in Southern Asia, particularly Bhutan, where it is quite a common surname, Nepal, where it is quite a rare surname, and Sri Lanka. Measured by absolute frequency, this name is the most popular in Indonesia, Egypt, and Nepal. Also, Guidar is the forename as well as the last name.