I have a Nancy and Hannah and calling themselves Ann .Also have an Elizabeth ,married as Frances ,and buried as Franny. Named her only daughter Elizabeth Frances .Called 1 of her sons Thomas Rodan Adamson, that led to her grandparents ,Frances Gibson and Thomas Rowden. In Scotland Jane Janet Jessie Jeanette all interchangeable. Early Grizal is Grace.
Edit-My sister in law was named Mary, but her Mother called her Maureen,and used that name all her life. Also another was named Agnes ,and used the name Nancy. Have a Mavis known as Toni.