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 my country (Spanish speaking) we say “Fulano de tal” Fulano is kinda like a template name nobody really is named like that. “De tal” really means something like “from somewhere”.
We dont out it on the graves, but we use it as slang for situations where we need to refer to someone generic like “imagine a fulano de tal doing xxxxxxxxxxx”.
There are other names like Zutano, Mengano, etc.
Edit: My mom sometimes uses “Miguel Perez”. Those 2 are very common first and last names.
Fulano, Zutano and Mengano are the Foo and Bar of spanish names.