Pre 1910 Grandmas and Great Aunts include (Birth name in brackets, if different) - Louie (Louisa-Anne), Dolly (Gladys), Elsie, Liz/Lizzie (Eliza) Sadie, Jess/Jessie (Jessica), Annie (Anne), Connie (Constance) Esme - pronounced with an ie ending not as Esmay (Esmerelda), Florrie (Florence)
Mum's generation - 1930's Maggie/Peggy/Daisy (Margaret), Betty, Betty/Liz/Lizzie (Elizabeth), Audrey, Ginny (Virginia) Penny (given name and short for Penelope, Bab/Barbie (Barbara)
My generation - 1960's (giving up on brackets) Jackie, Jenny, Tracy, Sally, Katy, Debbie, Julie, Melanie, Lizzie, Vicky, Nicky, Lindsey, Lesley, Cathy, Wendy, Penny, Teri. Also Sikh friends/colleagues Indy (Inderjit) Kam/Kammy (Kamaljit) Jas/Jazzy (Jasbinder/Jaswinder/Jasbir) and several Nikki (youngest child in family nickname)
Niece/Daughter - 1980's/1990's - Katy/Katie, Jessie, Becky, Lexie, Fran/Frankie, Dani, Lizzie, Charli, Vic/Vicki, Abi, Amy, Gabby, Lily, Rosie, Maddy
OP is perfectly correct that ie or y endings to names is a new trend.