Léon: The Professional (1994)
Mathilda, a 12-year-old girl, is reluctantly taken in by Léon, a professional assassin, after her family is murdered. Léon and Mathilda form an unusual relationship, as she becomes his protégée and learns the assassin’s trade.
Gaumont, Les Films du Dauphin
More movie information: https://www.imdb.com/title/tt0110413/