Cognomen Knull (Knull 
) , around the world, is a rare family name. The cognomen Knull is habitual in Germany, where it is a rare surname, Canada, and New Zealand. Measured by absolute frequency, the name is most common in Germany, the United States, and Canada. Much less frequently, Knull is the forename as well as the last name.
| josef nissley knull American entomologist (1891—1975) (b. 1891) |
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| dorothy johnson knull American entomologist and collector, US (b. 1908) |
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| brad knull director and filmmaker |
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| josef n. knull |
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