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Re: Horowitz
I suppose that it is a Jewish name from East Europe.In some Slavic languages (Chech, Ukrainian) there is a consonant change G -> H. So, that name might come from the word "gora/hora" meaning "mountain" and might be a translation, e.g., of the German name Bergman.
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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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