My mother's family origin is the FIX family of Oberschaeffolsheim (Alsace). We are connected with the KRAEMER family (same place, but coming in 1815 from Ingenheim (Alsace).
My oldest ancestor, Uri-Shraga FIX, born at the beginning of th 18th century, had his new family name (in fact a nickname) in connection with Uri-Shraga (Uri = "my light", in Hebrew; Shraga = "light", in Aramaic).
Here is a possible explanation of FIX coming from Feyvush:
Folk Etymology ============== One of the fascinating aspects of Alexander Beider's new book, "A Dictionary of Ashkenazic Given Names: Their Origins, Structure, Pronunciation and Migrations" (to be published by Avotaynu in July) is what he calls folk etymology. The origins of certain names are misunderstood by many people because they associate the name with words that sound similar to the given name. Many of these errors exist in current books about Jewish given names. Two of the more popular misconceptions are the origins of the feminine name Fruma and the masculine name Feivel (Fayvush).
Similarly, Fayvush has been misinterpreted as coming from the Greek name Phoibos, the god of the sun. Consequently, Jews have associated it with the given name Uri, which means "light." In his book, Beider conclusively demonstrates that Fayvush comes from the Latin word "vivus" meaning "living" or "alive" and was likely created as a calque of the given name Chaim (which means "life" in Hebrew) or Yechiel (whose definition includes the Hebrew verb meaning "life" in its structure).