Cognomen Østergaard (Østergaard 
) , in the world, is quite a common family name. The surname Østergaard is habitual in Northern Europe, particularly Denmark, where it is quite a common surname, Sweden, where it is a rare surname, and Norway. Measured by absolute frequency, the name is most common in Denmark, Sweden, and Australia.
| VARIANT | COUNTRY |
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| Østergaard | Australia, Denmark, Norway, United Arab Emirates, Sweden |
Oestergaard, Ostergaard, and Østergård
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vilhelm østergaard Danish writer (1852-1928), DK (b. 1852) |
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| p.c. østergaard DK (b. 1797) |
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| sophie østergaard Danish singer (1810-1866), DK (b. 1810) |
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| mads christensen østergaard (b. 1807) |
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lise østergaard Danish psychologist and minister (1924-1996), DK (b. 1924) |
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| carl v. østergaard 1879-1969 translator, literature historian, writer (b. 1879) |
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uffe østergaard Danish historian (b. 1945) |
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søren østergaard Danish actor, DK (b. 1957) |
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| anders østergaard (b. 1911) |
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| knud østergaard Danish politician (1922-1993), DK (b. 1922) |
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| wedell østergaard Danish cyclist (1924-1995), DK (b. 1924) |
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| niels østergaard Danish painter (1924-1974) (b. 1924) |
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| kristen østergaard (b. 1915) |
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morten østergaard Danish politician, DK (b. 1976) |
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| jens østergaard Danish musicologist (1929-2012) (b. 1929) |
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