Last name Onthank (Onthank 
) , around the world, is a rare cognomen. The family name Onthank is habitual in Northern America, particularly the United States, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Onthank | United States |
| nahum ball onthank American painter, US (b. 1823) |
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| ruth mclaren onthank Oregon plant specimen collector (1893-1978) (b. 1893) |
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| david c onthank researcher |
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