Explanations/etymology also appreciated!
For Joe Shmoe, it means a very average or below average person. It’s a derivation of the practice of using “shm-” to dismiss something (eg “Practice shmactice. We’re already perfect”).
And “John Smith” is meant to be the most average name or person imaginable, so they have the “most common” (citation needed) first and last name as well.
In Vietnam, I think it’s just most names 😂. Anh Nguyen is probably a good example. Most Vietnamese have the last name Nguyen. The national naming conventions rival that of religious families in the west. Think, Matthew, Mark, Luke, and John. Anh, An, Thanh, and Minh. Women are the same, but named after things considered beautiful, Tuyet, Hong, Pham, Van.
Funny enough, many names aren’t always gendered, so I’ve met a decent amount of couples with the same first and last names. An Thi Nguyen, and An Van Nguyen is a couple that comes to mind. I dont have to worry about doxxing, since I bet that exists over 1000x here.