Cognomen Lysaght (Lysaght 
) , globally, is quite a rare surname. The last name Lysaght is characteristic of Ireland, where it is quite a rare surname, New Zealand, and Australia. Measured by absolute frequency, it is commonest in the United States, Ireland, and the United Kingdom. Much less frequently, Lysaght is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lysaght | United Kingdom, Australia, Ireland, United States, New Zealand |
| thomas lysaght (born 1596) (b. 1596) |
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| john lysaght, 1st baron lisle Irish peer and politician (b. 1702) |
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| arthur lysaght (born 1710) (b. 1710) |
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| john lysaght, 2nd baron lisle Anglo-Irish politician (b. 1729) |
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| edward lysaght Irish poet and wit (b. 1763) |
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| john lysaght (1780-1781) (b. 1780) |
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| john lysaght, 3rd baron lisle of mountnorth (1781-1834) (b. 1781) |
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| arthur lysaght British Royal Navy officer (1782-1859) (b. 1782) |
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| george lysaght, 4th baron lisle of mountnorth (1783-1868) (b. 1783) |
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| john lysaght, 5th baron lisle of mountnorth (1811-1898) (b. 1811) |
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andrew lysaght, junior Australian politician (1873-1933), AU (b. 1873) |
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| thomas royse lysaght architect, GB (b. 1828) |
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| john arthur lysaght (1831-1872) (b. 1831) |
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| andrew lysaght Australian politician (1832-1906), AU (b. 1832) |
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| john lysaght Lysaght, John (1832–1895), manufacturer of sheet iron (b. 1832) |
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