Family name Illingworth (Illingworth 
) , in all the world, is quite a common last name. The last name Illingworth is characteristic of the United Kingdom, where it is quite a rare surname, Australia, and New Zealand. Measured by absolute frequency, this name is the most popular in the United Kingdom, the United States, and Australia.
| VARIANT | COUNTRY |
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| Illingworth | United Kingdom, Australia, Mexico, United States, Canada |
| william illingworth (1496-1543) (b. 1496) |
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| thomas illingworth (born 1612) (b. 1612) |
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| robert illingworth (born 1643) (b. 1643) |
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| jonathan illingworth (1672-1745) (b. 1672) |
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| james illingworth (1679-1739) (b. 1679) |
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| jonas illingworth (born 1720) (b. 1720) |
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john illingworth English general, GB (b. 1786) |
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| william illingworth (born 1744) (b. 1744) |
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| cayley illingworth Archdeacon of Stow from 1862 until his death (b. 1759) |
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| phineas illingworth (1763-1837) (b. 1763) |
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| william illingworth English lawyer and archivist, GB (b. 1764) |
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alfred illingworth British politician (b. 1827) |
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| daniel illingworth (1792-1854) (b. 1792) |
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frederick illingworth Australian politician (1844-1908), AU (b. 1844) |
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albert illingworth, 1st baron illingworth British politician (1865-1942), GB (b. 1865) |
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