Is Angela's mother Geli Raubai (Angela Raubai)? Is Geli Raubai also Eva? If it is not suitable to marry Geli Raubai because you are already related, why not agree to falsely claim that you were in a relationship with Geli and Eva at the same time and when Eva dies Geli takes her name/details, dyes her hair and stays indoors for a while? Both ladies are in the same age range. In photographs both ladies are very similar in looks. Curiously and just for completeness, there is one photograph of the Mitford sister which bears a striking resemblance to Angela, this sister passed away and that would fit with availability to dance the Argentine tango - but of course it does not fit with your statement about how names were chosen for children at that time in Germany. God bless to you all.