For the time being, I've dropped work on my mother's side of the family with about 1350 relatives traced and have shifted efforts to my father's side with close to 500 family members identified.
One of the challenges of tracking my American family is that immigrants and their children are often identified by multiple names. Records may show formal Italian given names, middle names that replaced first names and American names. Carmela becomes Clara and/or Millie, and in one case Rosario is Rosario Carlo or Charles. My father is like this. He's got three different first names depending on the official record and two different nicknames. My mother was given an Italian first name, but uses an English first name.
Some of the name translations are direct and easy to track. For example, Vincenzo becomes Vincent. But for reasons unknown, many Vincenzos went with Gimi, which became Jimmy or James. And the feminine version, Vincenza, becomes Vivian or something entirely different. Then there's Concetta, which becomes Tina, then Christina. But Christina can also come from Crocifissa which literally means Crucifix. Giovanna often becomes Jennie, but sometimes turns into Jean or Jane.
Also mind boggling is the mapping of intermarried cousins, marriages of multiple siblings in one family to multiple siblings in another family and marriages between members of different sides of my family at multiple points.
One instance occurs in my immediate family, so it's easy for me to understand, but people I've explained it to are often confused. My father's maternal aunt is married to my mother's brother, so my dad's aunt is also his sister-in-law and his nephews are also his first cousins. My first cousins are also my first cousins once removed and my mom's brother is sort of her uncle by marriage. And lest I forget, my cousins who are both first cousins and first cousins once removed are also my third cousins once removed, which arises from some earlier inbreeding shenanigans.
Stuff like that happens all over my family tree. The weirdest realization of all was that I'm my own 4th cousin.