I wonder what names are considered to be old-fashioned, but not in vintage way - but in “grandma and her friends” way?
In Polish it would be:
For me it would be:
Et cetera
In Greek it’s mainly certain nicknames:
for me it would be names like
[name_f]Eileen[/name_f]
[name_f]Patricia[/name_f]
[name_f]Kathleen[/name_f]
[name_f]Brenda[/name_f]
[name_f]Glynnis[/name_f]
[name_f]Barbara[/name_f]
[name_f]Pamela[/name_f]
[name_f]Pauline[/name_f]
[name_f]Veronica[/name_f]
[name_f]Marie[/name_f]
[name_f]Irene[/name_f]
[name_f]Janice[/name_f]
this is based on names that are common on older women in my area
[name_f]Vicky[/name_f]
[name_f]Peggy[/name_f]
[name_f]Marsha[/name_f]
[name_f]Jeanne[/name_f]
[name_f]Barbara[/name_f]
[name_f]Kimberly[/name_f]
[name_f]Christine[/name_f]
[name_f]Tracy[/name_f]
[name_f]Kathy[/name_f]
[name_f]Carol[/name_f]
[name_f]Beth[/name_f]
[name_f]Donna[/name_f]
[name_f]Marsha[/name_f]
[name_f]Martha[/name_f]
[name_f]Betty[/name_f]
[name_f]Susan[/name_f]
[name_f]Helen[/name_f]
[name_f]Jane[/name_f]
For me…
Debbie / Deborah
Doreen
Ruth
Pauline / Paula
Jill / Gillian / Jillian
Janet
Mary
Marianne
Rosemary
Julie
Jenny
Gail
Linda
Sue
(In england for context)
my two grandmothers, my step-grandmother, and my living great grandmother are [name_f]Deborah[/name_f] “Debbie”, [name_f]Kimberly[/name_f], [name_f]Candace[/name_f], and [name_f]Kathryn[/name_f] “Kay”, so i would definitely say those lean that way for me! 
i’m in the midwest united states, and these are some i see a lot on that age group…
[name_f]Cheryl[/name_f]
[name_f]Lorraine[/name_f]
[name_f]Belva[/name_f]
[name_f]Vivian[/name_f]
[name_f]Judith[/name_f]
[name_f]Dorothy[/name_f]
[name_f]Ina[/name_f]
[name_f]Martha[/name_f]
[name_f]Lois[/name_f]
[name_f]Eleanor[/name_f]
[name_f]Helen[/name_f]
[name_f]Frances[/name_f]
[name_f]Ruth[/name_f]
[name_f]Wilma[/name_f]
[name_f]Doris[/name_f]
[name_f]Anne[/name_f]
It depends whose grandma! My grandmothers and their friends (born 1930s) were/are called things like [name_f]Dorothy[/name_f], [name_f]Maureen[/name_f], [name_f]Hilda[/name_f], [name_f]Barbara[/name_f], [name_f]Maggie[/name_f], [name_f]Joan[/name_f], [name_f]Mary[/name_f], [name_f]Pauline[/name_f], [name_f]Anne[/name_f]. Some have come back around, some haven’t. But my mother and her peer group who are certainly granny-age, in their 60s, are called things like [name_f]Alison[/name_f], [name_f]Deborah[/name_f], [name_f]Sally[/name_f], [name_f]Wendy[/name_f], [name_m]Gill[/name_m], [name_f]Beverley[/name_f], [name_f]Janet[/name_f], [name_f]Linda[/name_f], [name_f]Judy[/name_f], [name_f]Christine[/name_f], [name_f]Karen[/name_f]. These are less stylish at the moment but I suspect will become trendy sooner rather than later!
Was going to say the same as @persephonescrown. My grandmothers, great aunts, and friends included the names Delphine, Annabel, Jean, Norma, Shirley, Eunice, Sibyl, Esmé, Margot, Sylvia, Maude, Evelyn, Mary and Joyce - many of which would fit right into a primary school classroom. Then I’m sure many of “our grandkids” will be given current Boomer grandparent names, which will be seen by their parents as “vintage”. For me in Oz, these are names like: Elizabeth, Judith, Mary-Lou, Christine, Margie, Jeanette, Maureen, Susan/ Suzette, Patricia, Geraldine, Irene, Virginia, Diane, Barbara, Elspeth, Rosemary & Monica. 100-year cycle!
For me, it would be:
Though I’m thinking more of people I know near my grandmas’ age rather than people who are grandmas now, like my mom. I agree it could vary greatly, and I’m loving seeing what’s a “grandma” name in non-English countries!