The Sabrina Name

Where did Sabrina's name come from? 

Credit for inventing Norma Sykes' stage name Sabrina is hotly contested.

1. Arthur Askey said it came from a play, 'Sabrina Fair'.
2. 'Blonde Bombshells' agrees it was Arthur's idea, but says the name came from a Milton poem and the 1954 movie character.
3. 'People' magazine June 55 said it was a BBC producer (Bill Ward) who named her after the Milton poem.
4. People magazine Sept 56 then said she chose it, from the 1954 movie of the same name.

Anyone ELSE have a theory?

As she told me, 'Sabrina' is her preferred name: she hates 'Norma'.  Her friends call her Sabby.