Surname Kayn (Kayn 
, カイン 
, Каин 
) , globally, is a rare cognomen. The family name Kayn is characteristic of Morocco, where it is a rare surname, Bulgaria, and Algeria. Measured by absolute frequency, it is the most numerous in Morocco, Russia, and Japan. Likewise, Kayn is the forename as well as the last name.
| gottfried von kayn DE (b. 1577) |
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| hilde b. kayn American artist, 1903-1950 (b. 1903) |
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| roland kayn German composer, NL (b. 1933) |
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| heinrich von kayn |
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