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Last name Rarus (Rar , Rarus ) , all around the world, is quite a common cognomen. The cognomen Rarus is characteristic of Israel, where it is quite a rare surname, Myanmar, and Oman, where it is a rare surname. Not in comparison with a country's population, it is commonest in Myanmar, India, and Israel. Likewise, Rarus is the forename as well as the last name.