What a fabulous question.
Joyce Beryl = Paternal grandma
Margaret Ellen Mignon = Maternal grandma
Valerie Eunice = step-grandma
Nora = grandma-in-law
I have three: my father's mother, my mother's mother, and my step-father's mother.
MM (who I'm very close with): Connie Jean.
my mom's mom is Christine. Her mother was Matilda, who went by Tillie.
my mom's dad's mom was Jeanette (I plan to honor her).
my mom's step mother is Margaret, who goes by Peg/Peggy. Her mother is Mary, I believe.
my dad's mom is Margaret, who goes by Marge. Her mom was Mary (coincedence...)
my dad's dad's mom was Maria...I think...that side is from Italy (my grandpa came over) so it's a bit hard to remember.
my step-dad's mother was Alberta.
Reva and Ellen. Both are incorporated in my daughter's name.
Irmelin Birgit (mother's mother) and Connie (father's mother).
paternal: Violet (she died years and years before i was born)
My grandmothers' names are Audrey and Margaret.
My great-grandmothers' names are Anna, Dorothea, Esther and Margaret.
My husband's grandmothers' names are Antonia and Maria.
Lois Ann - Maternal
Frederica Elizabeth "Frieda" - Paternal
Barbara Ann - Step-dad's mother
My paternal granddad was a serial monogamist, so I've also had step-grandmothers named Esme and Joanna.
Maternal: Margaret Claire (she goes by Claire)
Paternal: Miriam nn Mimi