Well, I don't know about
German, but in Croatian and other Slavic languages it's very, VERY rare. The only example I can think of is the Serbian tennis player Novak Dokovic. Novak is a very common last name, and this is the only time I've seen it as a first name.
In Croatia it only happens if the last name is also a first name, like
Marko,
Ivan, etc.
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Amadea
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MalinNausikaya
Prairie
AneurinIagoMadocShadrachTarka