Dean can be used as either a personal name or a family name.
American Roxane de la Roche graduated Le Cordon Bleu in Paris at age 22, Chef de Cuisine and Master Sommelier. Unsure about the youngest chef ever, but she was the youngest Female ever made MS.
See the related link below for a list of the different members of the kitchen brigade system.
It is a Toque blanche.
Jenson ackles