Assuming that the family name is a place name perhaps with the
    common suffix -er (as in Oberheimer), then it is very possible that
    the family did indeed come from that place (Oberheim) originally.

    But they probably left that place before they acquired the surname,
    which was probably before the earliest extant records, so you will
    likely never be able to prove it.  Also note that place names are
    often shared by several towns, and that a surname may be related
    etymologically but not genealogically to a place name.

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