In France each year there are 800,000 births, 800,000 names, 800,000 arguments!

Vincent (Patrick Bruel), a successful forty-something, is about to become a father for the first time. His sister Élisabeth (Valérie Benguigui) invites him to a dinner party at her beautiful apartment in Paris, with her academic husband Pierre (Charles Berling) and his childhood friend, Claude (Guillaume de Tonquédec).

Whilst waiting for Anna (Judith El Zein), his stylish younger spouse who is always running late, his cohorts gleefully bombard him with questions on his fast approaching fatherhood. But when his hosts ask Vincent what name he has chosen for his future offspring, his response plunges the family into chaos.