Where does “grammie” come from?

grammie (English) comes from English gramma, from English grandma, from English grand, from Middle English grand, from Anglo-Norman graunt, from Old French grant, from Old French -ur, from Latin -or — Creates action nouns or result nouns from verbs;...

Ancestry of “grammie”, step by step

grammie traces back through two separate lines of ancestry.

via English gramma

StepLanguageWordMeaning
1Englishgrammagrandmother; A variety of pumpkin, a cultivar of...
2Englishgrandmagrandmother
3EnglishgrandOf a large size or extent; great; Great in size,...
4Middle Englishgrand
5Anglo-NormangrauntLate Anglo-Norman spelling of grant
6Old Frenchgrantbig, large
7Old French-ur-er, used for form agent nouns
8Latin-orused to form a third-declension masculine...
9Proto-Italic-ōsCreates masculine action nouns or result nouns...
10Proto-Indo-European-ōsCreates masculine and feminine action nouns or...
11Proto-Indo-European-oss
12Proto-Indo-European-osCreates action nouns or result nouns from verbs;...

via English ie

StepLanguageWordMeaning
1EnglishieAlternative form of i.e
Every word from Proto-Indo-European -osEvery word from Latin -orEvery word from Old French -ur