Auvernas is a synonym used for more than one grape , e.g. for Chardonnay Blanc, Pinot Blanc, and for Pinot Noir.
For Pinot Noir this synonym is used in Orléans in France.
For the two other varieties no localisation of the synonym has been found yet, although Auvernas Blanc is used as a synonym for Chardonnay Blanc in the same area, e.g. in Orléans.