My grandparents from my fathers side are death. His mother I never realy saw just once or twice, Idk and his father I never saw because he died when I was a baby. My grandparents from my mothers side I call Omi and Opa
In Sinhalese, we call grandmothers by various names - Aachchi (the most popular one), Aththamma, Kiri Amma and so forth. I call my maternal grandmother, who left all of us when I was only five 😭 as Aachchi. I call my paternal grandmother as Aththamma, because that's how I was told to call her from my childhood. We call grandfathers by these names - Seeya, Muththa and Kiri Aththa. I call both of my grandpas by 'Seeya'.
My dad's parents: "Діда" and "Valimama" (bc her name's Valentina)
My mother's father passed away when my mom was young, and I call my maternal grandmother "Animama" (her name's Anna)