This is probably a "half-translation" of Morgenstern, the
German surname (often Jewish but not always) that means "morning star".
There are other examples of "half-translations" or "partial Anglicizations" among Jewish families in the USA. Greenberg and Greenbaum, for example, are from Grünbaum and Grünberg, while Silverberg is from the
German or Yiddish Silberberg.