My maternal grandparents were Bobe (grandmother) and Zeyde (grandfather), which are Yiddish (my mom was born in Germany just before her family fled Germany during the Nazi reign).
My paternal grandparents were also from Germany and we called them Oma/grossmutter (pronounced gross-mooter with a rolling of the first R
) and Opa/grossvater (pronounced gross-votter with the same rolling R). The Oma and Opa were informal but there were times when we used the more formal out of respect.
Cheyanne called her paternal grandmother Nana (DH's father died long before she was ever born). She calls my parents Grammie and Grampie.