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Around the world, Hainer (Hainer , 海内 ) is a rare largely male, but seldom female forename. The first name Hainer is habitual in Costa Rica, where it is a rare boy's name, Germany, and Colombia, where it is a very rare boy's name. Not in comparison with a country's population, this name is the most popular in Germany, Colombia, and China. More frequently, Hainer is the last name as well as the forename.