Cognomen Kaas (Kasi 
, كاس 
, Kaas 
) , around the world, is a common last name. The cognomen Kaas is characteristic of Suriname, where it is quite a common surname, Estonia, and Denmark. In absolute terms, it is commonest in India, Pakistan, and Indonesia. More prevalently, Kaas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kasi | Indonesia, Malaysia, United States, India, Pakistan |
| كاس | Iran, Sudan, Algeria, Egypt, Iraq |
| Kaas | Germany, Indonesia, Algeria, United States, India |
| Каас | Kyrgyzstan, Kazakhstan, Russia, Ukraine |
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niels kaas Danish politician, DK (b. 1535) |
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jørgen kaas DK (b. 1554) |
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| jens kaas (b. 1516) |
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| frands kaas (b. 1579) |
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| jørgen kaas Danish military officer (b. 1618) |
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ulrik kaas Danish military personnel (1677-1746), DK (b. 1677) |
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henrik bielke kaas Danish military personnel (1686-1773) (b. 1686) |
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helene sophie kaas (b. 1680) |
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| hans kaas Danish officer, DK (b. 1640) |
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| jorgen grubbe kaas 22 Jan 1643 - 11 Dec 1711 (b. 1643) |
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| johann ivar von kaas NL (b. 1644) |
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otto ditlev kaas 4 Jun 1719 Nedergaard - 6 Jul 1778 Nedergaard (b. 1719) |
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wolfgang kaas (1724-1778) (b. 1724) |
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frederik christian kaas Danish naval officer and admiral, DK (b. 1725) |
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frederik christian kaas Danish naval officer (1727-1804), DK (b. 1727) |
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