Last name Knaak (Knaak 
) , globally, is quite a rare surname. The surname Knaak is habitual in Germany, where it is quite a rare surname, Brazil, where it is a rare surname, and the United States. Very seldom, Knaak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Knaak | Spain, Brazil, Poland, United States, Germany |
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hans-wolfram knaak German officer (1914-1941), DE (b. 1914) |
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| kurt knaak German author (1902-1976), DE (b. 1902) |
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rainer knaak German chess player, DE (b. 1953) |
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| gerhard knaak German career soldier, DE (b. 1906) |
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| hermann knaak provided affidavit for Karl Sommer, DE (b. 1910) |
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| ursula knaak German pediatrician, DE (b. 1918) |
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| hans-wolfram knaak DE (b. 1914) |
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| lothar knaak Swiss psychotherapist (1925-2006), CH (b. 1925) |
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| delores j. knaak American educator and politician, US (b. 1929) |
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will knaak American guitarist (b. 1984) |
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turid knaak association football player, DE (b. 1991) |
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| peter knaak Canadian politician, CA (b. 1942) |
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rebecca knaak German association football player, DE (b. 1996) |
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| fritz knaak American lawyer and politician, US (b. 1953) |
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| manfred knaak German musician, DE (b. 1960) |
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