There is also a possibility of his name being written as Biagio Renzi, don't you think?
Since the surname sounds like a given and last name together, perhaps someone thought he was giving his first, middle and last name, so they left out the "middle name"?
I say this because I have been searching extensively (as I am sure you are) for that elusive arrival manifest for Biagio. I located a Canadian Manifest from April 1901 (works with the children's births), and lists Biagio Renzi, age 33 (birth about 1868 putting him in the same "era" as Silvestro)
Unfortunately, the manifest has very little information beyond his name, age, occupation (laborer) and country of origin (Italy).
Perhaps we should look more for Renzi?
Here is the link
https://familysearch.org/ark:/61903/1:1:2QSR-XSG
Of course, I have also seen misspellings such as Morenzi, Marenzi, Merenzi, Maiorenzi, etc.
T.
