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Surname Тройер (Troyer , Trojer , Тройер) , worldwide, is a common cognomen. The cognomen Тройер is habitual in Austria, where it is quite a rare surname, Belgium, and Slovenia. In absolute terms, it is commonest in the United States, Austria, and Belgium.
VARIANT | COUNTRY |
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Troyer | Belgium, Italy, Austria, United States, Canada |
Trojer | Germany, Italy, Austria, United States, Slovenia |