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Family name Agar (Ogar , Agar , Агар ) , in the world, is a common last name. The last name Agar is characteristic of Nigeria, where it is quite a common surname, Estonia, where it is quite a rare surname, and Ireland. Measured by absolute frequency, this name is the most popular in Nigeria, the United Kingdom, and the United States. Also, Agar is the forename as well as the last name.