Joan did not have either a blind brother or friend. This character is purely fictional and was created in the movie to show how kind Joan was to the disadvantaged. Even though this is historically inaccurate it did show, correctly, Joan's kindness to those who are less fortunate.
Joan had three brothers: Pierre d'Arc Jacquemin d'Arc Jean d'Arc
Joan of Arc's sister's name was Catherine.
Joan Ciccone's birth name is Joan Gustafson.
Joan Blondell's birth name is Blondell, Rose Joan.
Yes, Joan is a name.
No, Joan is a female name. Think of Joan Rivers.
Joan Jett's birth name is Joan Marie Larkin.
Joan Rydell's birth name is Joan Reddell.
Joan Samuels's birth name is Joan Samuels.
Joan Terrace's birth name is Joan Tarshis.
Joan Winfield's birth name is Joan MacGillicuddy.
Joan Weldon's birth name is Joan Welton.