Honorifics for Knighthood
From AmtWiki
Honorifics for Knighthood
There are many and varied honorifics for Knighthood, depending on the person's persona, personal quirks and gender, it is wise to know the knight in question's wishes. Many male knights Such as Deigo have chosen the traditional male Spanish honorific of [Don], while some knights use still other variations such as the modern Syr or Ser. Sir is the common male honorific for knighthood
Some female knights use Sir as well, as the alternative, [Dame] historically sometimes meant the wife of a knight, was a title by proxy, not directly upon the recipient.
At the end of the day it's all a matter of choice.