Birth name
Julia Jean Mildred Frances Turner or 'Julia Jean Turner?

Julia Jean Mildred Frances Turner
 Britannica  (though it says FrancIs).  
 [www.cmgww.com/stars/turner/biography.htm The Official Lana Turner Web Site]
 NY Times obit
 The New Biographical Dictionary of Film Fifth Edition
 Life - 23 December 1940 - Page 63
 Who's who at Metro-Goldwyn-Mayer., 1944, Page 28
etc. etc.

Julia Jean Turner
 Turner's autobiography says her birth certificate says....

Does anything else specifically exclude "Mildred Francis"?

All the best:  Farmbrough, .