Cognomen Lenaghan (Lenaghan 
) , all over the world, is a rare family name. The surname Lenaghan is characteristic of Ireland, where it is quite a rare surname, Mauritius, and Australia, where it is a rare surname. Measured by absolute frequency, it is commonest in the United Kingdom, the United States, and Australia.
| VARIANT | COUNTRY |
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| Lenaghan | United Kingdom, Australia, Ireland, United States, Canada |
| john lenaghan English footballer (1888-1954), GB (b. 1888) |
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| kim lenaghan British broadcaster (b. 1901) |
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| brenda lenaghan GB (b. 1941) |
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| denis lenaghan Australian rules footballer (b. 1956) |
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| mick lenaghan Australian rules footballer (b. 1958) |
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| andrew lenaghan (b. 1965) |
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| scott c. lenaghan researcher |
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| elizabeth lenaghan Peerage person ID=353176 |
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| james a. lenaghan |
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