Yes, Joan of Arc was French.
"Joan of Arc, or Jeanne d'Arc in French, (c. 1412 – May 30, 1431) was a 15th century saint and national heroine of France. She was the only person ever recorded to have commanded the entire army of a nation at the age of seventeen; she was captured by the English and tried by an ecclesiastical court led by Bishop Pierre Cauchon, an English partisan, the court convicted her of heresy and she was burned at the stake by the English when she was nineteen years old. Twenty-four years later, the Vatican reviewed the decision of the ecclesiastical court, found her innocent, and declared her a martyr. She was beatified in 1909 and canonized as a saint in 1920."
https://en.wikipedia.org/wiki/Joan_of_Arc
I've just found another site, that also confirms that Joan of Arc was born in Domremy, France, here is what it says:
"Joan of Arc was born on January 6, 1412, in Domremy, France. She "heard voices" that led her to raise an army to free Orleans from a British seige. She was captured, tried as a witch, and burned at the stake. In 1920, Joan of Arc was canonized a saint by the Catholic Church."