Surname Slack (سلاك 
, Slack 
, Llac 
) , in all the world, is a common cognomen. The surname Slack is characteristic of Saint Kitts and Nevis, where it is quite a common surname, Isle of Man, and the United Kingdom, where it is quite a rare surname. Measured by absolute frequency, the name is most common in the United States, the United Kingdom, and Canada.
| thomas slack English printer and newspaper proprietor (b. 1723) |
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| eliphalet slack (b. 1743) |
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| samuel slack British singer, GB (b. 1757) |
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william y. slack Confederate Army general, lawyer and politician (1816-1862), US (b. 1816) |
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james r. slack American general, US (b. 1818) |
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| thomas cartwright slack (1779-1815) (b. 1779) |
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| elijah slack American physician, US (b. 1784) |
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| hiram slack British cricketer (1808-1853) (b. 1808) |
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| henry james slack English journalist, activist and science writer (b. 1818) |
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lemuel ertus slack American politician (1874-1952), US (b. 1874) |
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| john hamilton slack American zoologist (b. 1834) |
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| hiram slack English cricketer (1843-1918) (b. 1843) |
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clayton k. slack United States Army Medal of Honor recipient, US (b. 1896) |
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chester warner slack American artist (b. 1899) |
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| john bamford slack British politician (b. 1857) |
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