During the French Revolution and the period immediately preceding it. (1770s-1790s)
Since I don't know of any naming statistics, I took some examples of people who were executed or put on trial during the Revolution.
Louis Thomazeau, 53, tinsmith, born in Nantes.
Marie Chapelain, 30, dressmaker, Saint-Malo.
Henry-Pascal Gaunot, 28, employee (possibly a servant), Talmont.
Julie Boissard, 18, day laborer, Palnot.
Agathe Gréaude, 19, dressmaker, Palnot.
Marie Joly, 22, dressmaker, Palnot.
Anne Morisset, 40, day laborer, Palnot.
Charles Oliveau, 36, locksmith, Palnot.
Pierre Vimard, 27, second-hand trader, Caen.
Pierre Ratieville, 55, soap maker, Rouen.
Antoine Soyer, 50, chimney sweep, Rouen.
Pierre Chaux, 35, merchant, Nantes.
Jean-Baptiste Mainguet, 56, needle maker, Nantes.
Jean Lévêque, 35, mason, Mayenne.
Pierre Gallon, 42, refiner, Nantes.
Jean-Baptiste Joly, 50, tanner, Angerville-la-Martel.
As you can see there's a lot of variation in surnames, but some common first names.