To add more possibilities to this growing list:

My German-Jewish mother's secular name was Jettchen (pronounced Yettchen), a diminutive of the nickname for Henrietta.  (I won't go into what her "Hebrew" name was, as this would only add confusion). 

However, no-one called her Jettchen; they used one of two other nicknames:  Hette and Hetti.

I always thought that a nice Hebrew name to go with these would be Hadassah.
--
Fredel Fruhman
Brooklyn, New York, USA