Where does “granpy” come from?

granpy (English) comes from Sranan Tongo granpa, from English grandpa, from English PA, from English papa, from Portuguese papá, from French papa, from Middle French papa, from Old French papa — to scrape, shave, sharpen.

Ancestry of “granpy”, step by step

granpy traces back through two separate lines of ancestry.

via Sranan Tongo granpa

StepLanguageWordMeaning
1Sranan Tongogranpagrandfather
2Englishgrandpagrandfather
3EnglishPAInitialism of public address; Initialism of...
4EnglishpapaDad, daddy, father; a familiar or old-fashioned...
5Portuguesepapádad; daddy; father; food
6Frenchpapapapa, a child's father; also as form of address:...
7Middle Frenchpapa
8Old Frenchpapa
9Latinpapaan infant's cry for food; father; bishop
10Ancient Greekπαπᾶςpriest
11Old Norsesúlapillar, column
12Proto-Germanicsūlizbeam, post; column, pillar
13Proto-Indo-Europeanḱsewl-
14Proto-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-