I really don't like names that are boy's names with an A at the end for example Edmonda, Daniella, Gabriella, Ivana, etc. And Samuela is one of them because the boy name is Samuel.
In English it might be mainly pronounced /sam-iuol'-a/ (the ' means accented syllable) as in the masculine form "Samuel", plus "a" at the end. I think this pronunciation is weird and not so nice-sounding. In Italian Samuela is very pretty, pronounced /sam-ooo-e'-la/ with the "e" sound the same as the "e" in "bed". For an English-speaking country, I would consider Samuella /sam-ooo-e'-lla/ so as not to confuse the pronunciation with Samuel.
I like rare names that work in both Italy and the U.S. and this one does. Plus in Italy it is sophisticated and uncommon. My name is Samantha and as I grew up as a child and teen my name was considered unusual and interesting. Now my peers have grown up and named their daughters this name and it is way way too common now. I became interested in Samuella through my own name and love its sound as well as the fact that it is rare.