Last name Louthe (Louthe 
) , in the entire world, is a very rare surname. The surname Louthe is habitual in Ireland, where it is a rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. In absolute terms, this name is the most popular in Ireland, India, and the United States. Predominantly, Louthe is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Louthe | Philippines, United States, Democratic Republic of the Congo, India, Ireland |
| robert louthe (d.c.1434) of Hertingfordbury, Herts |
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| roger louthe, of sawtrey - Aft 1435 |
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| thomas louthe, of sawfry - 26 Oct 1533 |
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| lionel louthe, of beames, hunts - 29 Nov 1471 |
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| edmund louthe, of sawtry - 1522 |
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| william louthe |
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