By "the Dauphin" I assume you are speaking of Louis XVI 's son, who was killed along with his parents during the French Revolution late 18th century. He was not killed like his parents, but rather was imprisoned for the remainder of his life. He died in prison at the age of 10, roughly two years after his parents and siblings were beheaded in 1793.
As to the question, no, the French government has never apologized in any official capacity for the actions taken during the French Revolution against the monarchy.
The Dauphin was the heir the the French Throne. "The Dauphin was Louis the XVI."
dauphin [do-fan] (cut the ending sound very short; the french do not pronounce the end of the N)
dauphin
The word "dauphin" is masculine. In French, it is used to refer to the eldest son of the king of France.
The French word "dauphin" is pronounced as "doh-fanh." The "ph" is pronounced as an "f" sound.
"dauphin" is the french equivalent of a duke or Price next in line for the throne). In the story the man who calls himself the dauphin is saying that he is the long lost heir to the french throne after the revolution in France, making him in french tradition, the rightful heir to the throne and thus the dauphin.
le Dauphin
A dauphin is the eldest son of the King who is the direct heir to the throne
le dauphin
A dolphin is "un dauphin" (masc.) in French.
A French king's son is typically referred to as "le dauphin" in French, which translates to "the heir apparent to the French throne." The title of Dauphin was historically used in the French monarchy to designate the crown prince.
ankair la visans! ----- according to google translate: J'aime les dauphins