Sardina,Sardinia, Sardigna, Sardenga/ New Orleans LA

I have seen this name spelled so many ways and I was wondering about the in-laws from New Orleans, LAUSA.They are from that area and his ggrandfather spelling is Sardina, and Sardigna. His first name was Andrea or Henry. I sense it was a pronuciation problem. Same as the last name and how the census taker spelled.
Anyway if you have heard of this branch from 1860's, please let me know.

Nancy Sardenga