I have an ancestor, Mary Aloysius (Garetti/Gareti/ Garrete) Saunders: https://www.wikitree.com/wiki/Garetti-1
Her father is Campbell Garetti/Gareti/Garrete, born about 1813, whose father is from France, his mother from Louisiana. Because his name is not an English name, I can't isolate his family or even a common spelling of his name. It's never spelled the same way twice. It's hard to trace this grandfather if I don't know how his father might have spelled his name when he immigrated. (I took ancient "dead" languages in college, I don't speak French at all).
I'm asking anyone familiar with Louisiana Cajun/Creole French or even just plain French to give me some help. What is the most common spelling of his name? How would it have been changed once they settled in Louisiana? Any suggestion is greatly welcomed.
Thanks so much for your time. :)