See the full list at Snark Hunting – anonymous names (such as John Doe in the US) from around the world
Australia Fred Nurk, Joe Farnarkle
Austria Hans Meier, Hans Maier, Hans Mayer, Herr und Frau Osterreicher
Belgium Jan Janssen, Piet Pietersen
Brazil Beltrano, Ciclano, Fulano, Ze ninguem, Joao da Silva, Ze da Silva, Joao Ninguem, Maria Ninguem
Canada G. Raymond