dragoon is the English phonetic spelling of the French dragon.
Just as rookie is the English phonetic spelling of the French recrue.
Incorrect. The English pronunciation of the "oo" in dragoon does not sound like the French pronunciation of the "o" in dragon.
Also, a phonetic English rendering of the French recrue would be something like rehkrew, not rookie.
You mean, Why is a "Castle shaped thing, or Castley looking thing, called a Rook(??)
That was the OP’s question in August 2007. Nothing has been offered that is superior to answers he received in September 2007.