Bubby, derived from the Yiddish word 'bobe,' meaning grandmother, is an informal and affectionate term used for a grandparent, particularly on the maternal side in Jewish communities. It has gained wider usage beyond its original cultural context and is often employed as a familiar way to address any elderly woman or even as a playful nickname among friends.
"Bubby had a notable resurgence in popularity during the mid-20th century, with five babies named Bubby born each in 1933, 1955, and 1969."