One such question is "Are there names that are thought of as uniquely American?" Here's my answer.
I think of doubled names as uniquely American, and probably uniquely Southern. You know the ones: Billy Bob, Mary Sue.
Having a line of descendants, all with the same name seems American to me. You know, like Martin Luther King, Jr. and Thurston Howell III.
Similarly, do you remember “John Boy” in the TV show The Waltons? Called that because his father was also a John? I don’t know if that’s a real thing or not, but if so, it’s American.
There were the Biblical names that got adopted in earlier years: Seth, Zeke, Amos and the rest. I don’t think they were that common outside the US.
Finally, there are the odd (to me) names that are adopted in the American Black community pretty much because the parents like the sound of them. There are Aaliya, De-Wanda, Devisha, Imani, Jayla, Kayla, Kiara, Laila, Makayla, Nevaeh, and so on for girls. Check here for more:; . There are Jenell, Jermain, Jeron, Jerrick, Jessan, Jimar, Jimarcus, Keandra, Kaynard and many more for boys. Here is a list:
Another dead give-away for an American is the name of an American or Confederate hero being used, such As Robert (Bob) E. Lee Ewell or George Washington Carver.