Fulano, Sicrano, & Beltrano
All three are name fillers for when you don’t know a person’s name (or when it doesn’t matter what they’re called).
Kind of like the equivalents of “So-and-So” and “What’s-His-Face” in English.
Usually if you’re only “naming” one person you use Fulano, if you need two you add Sicrano, and if you need three you add Beltrano.
Like in England when u say “tom, dick and harry”
Very close, but not quite, ‘cause no one would name their kid Fulano, Sicrano, or Beltrano. They’re not real names. :)