Family name Unthank (Unthank 
) , across the world, is a rare last name. The surname Unthank is habitual in Australia, where it is a rare surname, the United Kingdom, and New Zealand. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Australia.
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| Unthank | New Zealand, Australia, United States, United Kingdom, South Africa |
| mary unthank (1642-1724) (b. 1642) |
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| william s. unthank American artist, 1813-1892 (b. 1813) |
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| william unthank American painter, US (b. 1829) |
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| nellie unthank American settler (b. 1846) |
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| achilles william unthank (b. 1838) |
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denorval unthank American physician and civil rights activist (1899–1977), US (b. 1899) |
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| valda unthank Australian cyclist, AU (b. 1909) |
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| chris unthank Australian steeplechase runner, AU (b. 1972) |
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| robert unthank Peerage person ID=345213 |
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| elizabeth unthank Peerage person ID=345214 |
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| matthew g unthank researcher |
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| joseph l. unthank professor emeritus of physiology |
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| michael d. unthank |
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| gertrude unthank |
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