Hi Pierre,
This dish was given that name by the duke of Lévis-Mirepoix, a guy with the name Gaston Pierre de Lévi. Actually, his cook invented it, who happened to be a Dutch guy, captured by the inquisition during his summer holiday. He was released on the condition that he would create a famous dish for king Louis XVI
The truth is over here: http://en.wikipedia.org/wiki/Mirepoix_%28cuisine%29, with (strange, but true) a lot more information than the French Wiki.
Regards,
Willem











