Charles Guillaume Le Normant d'Étiolles

d'Étiolles was the surname of Jeanne-Antoinette Poisson's husband. They married sometime after her adventures with the Tenth Doctor, and Jeanne-Antoinette took his surname; however, they later legally separated and she reverted to "Marquise de Pompadour". (PROSE: The Time Lord Letters)

Behind the scenes
In real life, his full name was.