The name Soltis is of Slovak origin. It is a common surname in Slovakia and is derived from the Slovak word for "salt."
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There are thousands if not tens of thousands of words of French
origin in common use in English. It would be impossible to list
them all in this space. "Impossible" and "space" are two of
them.
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Origin of Vincent: Latin (Vincentius) Usage of Vincent: English,
Dutch, French, Swedish, Norwegian, Danish, Slovak
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The official English name of Slovakia is "Slovak Republic."
Therefore, "Slovak" is the correct adjective to use.