Terminology/Place Location

I am researching a Mexican marriage record from 1755 in which the groom is described as 'flamenco de Nasion originario de la Ciudad de Dunquerque'. I interpret this as a gypsy from the city of Dunkirk (France). I am not sure what the 'de Nasion' signifies unless it means gypsy nation or of this nation. If anyone has encountered this terminology or has any suggestions, I would greatly appreciate your thoughts.

Omar Codina