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Re: Horowitz
That's exactly what I found after I posted ...thanks for confirming!
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Horowitz is the German version of a Czech place-name, Horovice. The letter R has a mark over it in the Czech version to indicate that it is pronounced like R in Dvorak.
Re the Slavic G/H change; sometimes this name became Gurevitch in Russia, giving it the appearance of a patronymic.
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That's the origin I've heard too
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