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Last name Mirth (Mirth ) , in the entire world, is a rare surname. The cognomen Mirth is characteristic of Austria, where it is quite a rare surname, Croatia, where it is a rare surname, and the United States, where it is a very rare surname. Measured by absolute frequency, it is commonest in the United States, Austria, and Germany. Likewise, Mirth is the forename as well as the last name.