Everybody outside Holland spelled his name with one a anyway.
Pieter Cornelis Mondriaan until Piet dropped an 'a' when he was in Paris.
Inj 1911 when he left Holland for Paris.
Piet Suess's birth name is Paolo Piet Wolff Suess.
He moved to American and changed his last name slightly from Mondriaan to Mondrian
Piet van Deurs's birth name is Jan Piet Schnheyder van Deurs.
Piet Schrijvers's birth name is Pieter Schrijvers.
Piet Bergers's birth name is Petrus Bergers.
Piet Balfoort's birth name is Pieter Balfoort.
Piet Bron's birth name is Petrus Bron.
Piet Paulusma's birth name is Pieter Paulusma.
Piet Dankert's birth name is Pieter Dankert.
Piet Ekel's birth name is Pieter Ekel.