Guillaume Emmanuel Marie de Quengo de Tonquédec is a French stage, television and film actor. He first became known in his homeland for his role as Renaud Lepic in the TV series Fais pas ci, fais pas ça (2007–2017) on France 2, before winning the César Award for Best Supporting Actor for his performance in What's in a Name? in 2013.

What's in a Name? is a French-Belgian comedy film, written and directed by Alexandre de La Patellière and Matthieu Delaporte and released in 2012. It is adapted from the play Le Prénom by the same authors. The film was a box office success in France, selling 3,340,231 tickets.