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English word grandpop comes from English pop, English grand- (Of a generation removed from the original noun.)
pop (English)
Used to represent a loud, sharp sound, as of a cork coming out of a bottle. (Russian Orthodoxy, uncommon) A Russian Orthodox priest; a parson. (colloquial) Affectionate form of father. (colloquial, in the phrase "a pop") A portion, a quantity dispensed.. (computing) The removal of a data item from the top of a stack.. (countable) A loud, sharp sound as of a cork coming out of a bottle.. [...]
grand- (English)
Of a generation removed from the original noun.
grandpop (English)
(US, informal) grandfather.