Where does “grandpy” come from?

grandpy (English) comes from English grandpa, from English PA, from English papa, from Portuguese papá, from French papa, from Middle French papa, from Old French papa, from Latin papa — to scrape, shave, sharpen.

Ancestry of “grandpy”, step by step

grandpy traces back through two separate lines of ancestry.

via English grandpa

StepLanguageWordMeaning
1Englishgrandpagrandfather
2EnglishPAInitialism of public address; Initialism of...
3EnglishpapaDad, daddy, father; a familiar or old-fashioned...
4Portuguesepapádad; daddy; father; food
5Frenchpapapapa, a child's father; also as form of address:...
6Middle Frenchpapa
7Old Frenchpapa
8Latinpapaan infant's cry for food; father; bishop
9Ancient Greekπαπᾶςpriest
10Old Norsesúlapillar, column
11Proto-Germanicsūlizbeam, post; column, pillar
12Proto-Indo-Europeanḱsewl-
13Proto-Indo-Europeanḱsew-to scrape, shave, sharpen

via English Y

StepLanguageWordMeaning
1EnglishYA figure or mark in the shape of the letter Y; A...
2EnglishyuriA narrative or visual work featuring a romance or...
3Japanese百合lily
4Japanese連用形an inflectional category: the continuative or...
5Japanese見るto see, to watch, to observe, to look at...
6Japanesea dream; a vision; leaving reality to the state...
7Old Japanesea dream
8Japanesean order in biology: smaller than a class, bigger...
9Middle Chinese
Every word from Proto-Indo-European ḱsew-