My first impression of Sidalie is that it's a variant of
Sidonie, which itself is a French female name. Since Louisiana Creole is a French-based language, primarily a French language combined with Spanish, Native American, and West African languages, to me it seems likely it's based on
Sidonie. Cedalie looks like a variant spelling of Sidalie. But that's just my opinion- I couldn't find much information behind the name's origin.
“Ideals are like stars; you will not succeed in touching with your hands. But like the seafaring man on the desert of waters, you choose them as your guides, and following them you will reach your destiny.”
-
Carl Schurz