Some of these names are found in my family and some are those others have told me about. I guess our ancestors liked 'nicknames'. Some of these do not even seen remotely related as nicknames, such as Polly being another name for Mary.
Adelaide - Addie, Ada, Della, Ida
Adeline, Adelaide - Addie, Ada, Ida
Agnes - Nessi
Alice - Elsie
Antoinette - Nellie, Toni
Arabella - Belle, Bella