Firstly: a plea from my 80 year old neighbour... she says ''please never call your daughter 'Winifred' or she will never forgive you!''
(If i was given just £1 for every elderly lady i meet who hates her name & uses a totally different name; then i would be very rich indeed, so beware!).
Re: 1950s names - These are the most common names of the women i know born 1945-59; quite often they seem to prefer to use nicknames based on their Christian names:
Susan (Sue)
Jacqueline (Jackie)
Julie (Jules)
Valerie (Val)
Patricia (Pat, Patsy, Tricia, Trisha, Trish)
Joyce (Joycie)
Christine (Chris, Chrissie, Chrissy, Christy, Tina
Jane / Jayne (Janey)
Ann / Anne / Annette / Annie
Barbara (Babs)
Carol / Caroline
Janet (Jan)
I think it's best to try to be original (but not eccentrically so) in name choices if possible.
For example i know lots of women named 'Sue' in the 35 - 65 age group (the younger Sues tend to be Suzanna / Suzanne or Susanne / Susanna as well as Susan.
I think Susan is a pretty name actually, but the name is so common that in conversation i have to use extra identifiers eg. give a surname / description or my relationship to the 'Sue' in question.