◾ Monsieur Dupont - in France (outdated - in the 2070ies French Johnsons use various pseudonyms like Martin, Leblanc, Beaumont, Sinclair or Noël)
No matter what the wikia says, I doubt this highly - mostly because the 'Mr. Johnson' thing is supposed to be both anonymous
and automatically tell the people you're meeting with 'who you are'. Mr. Johnson (or Mssr. Dupont, or Ginoo Salaysay, 'Mr. Tell', from the Phillipines and
Pananagutan) is your employer. It's
already a pseudonym, so whomever wrote that into the wikia was pretty much being a moron.