GrandadWhat and how did your grandfathers (whether you or your kids) get called?

I think "gee gee".I have a friend who is called "Ganky" by his grandkids as that's what the oldest started calling him instead of Grampa.
Can someone enlighten me on the pronunciation of "Gigi?" Is it 'gee-gee' (like G-G) or giggy?

We use Memere et Pepere*, as well. We also used Memere et Pepere* for my father's parents and Grandma and Grandpa for my mother's (not French) side. My cousins who had two sets of French grandparents used Memere Lastname and Pepere Lastname (and, because the family came from a pretty insular area where everyone knew everyone, we'd call each others grandparents by those terms, too (except for one set of cousins' other grandmother, she was always Madame Lastname, never Memere Lastname.)My grandparents were named because of their nationality. My maternal grandparents were Memere and Pepere (French) and my paternal grandmother was Vovo (Portuguese)
I guess this makes choosing a name easier. My DH also grew up with a Memere and Pepere so if we are ever lucky enough to become grandparents ( not looking very promising right now), we will be the same.
My sons called my parents Memere and Vavo bc my mom is French and my dad Portuguese. Haha