Is some of that just that people tend to refer to grandparents as "grandma" and "grandpa" and not their first names? And maiden names of grandmothers have long

Is some of that just that people tend to refer to grandparents as "grandma" and "grandpa" and not their first names? And maiden names of grandmothers have long fallen into disuse by the time their grandchildren are born, if they didn't keep them? I think I didn't really know my maternal grandparents' names until they died and I looked at a family tree. My paternal grandfather's name isn't even well-defined: it's been butchered after 4 civil wars & invasions, 2 emigrations, different dialects, repeated anglicizations, and a change in the orthography of his native language.