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Family name Louth (Louth , 劳思) , throughout the world, is quite a rare last name. The family name Louth is habitual in Ireland, where it is quite a rare surname, the United Kingdom, and Zimbabwe, where it is a rare surname. Measured by absolute frequency, the name is most common in the United Kingdom, the United States, and Zimbabwe. Likewise, Louth is the forename as well as the last name.