You know, the generic “three guys”:
“If I let you have a second helping of tripe, I’ll have every Tom, Dick, and Harry asking for more.”
And their singular friend, So-and-so:
“How come you invited so-and-so to the party but you didn’t invite me?”
So, how do you say these in your language?
I’ll start with Portuguese:
Multiple: fulano, beltrano e sicrano
Singular: “fulano” or “fulano de tal”