Lots of Robertos came to from Serino, Italy to Connecticut in my great-grandparent's generation. As families settled and had kids, their kids started their own families and took on new last names.
For instance, some of the family we see the most in Connecticut are descendants of my first cousin twice removed, Grace (Roberto) Debonee. Through Aunt Grace, the Robertos expanded into Debonee's and Rubino's.
Through my 2nd great-aunt, Connie (Concetta), there are Demeo's.
My great-aunt Connie (Concetta) married a Muscolino. Through Aunt Connie, the Robertos became Muscolino's and Cutler's.
Through my great-uncle Jo (Giuseppe), there are Stoddard's.
Rubino's, Debonee's, Demeo's, Muscolino's, Cutler's, and the remaining Roberto's all descend from Roberto's in Serino, Italy.