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 only had one full sibling, a brother named Pierre. She did not have a sister.
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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 Marion's birth name is Joan Nicholls.
Joan Lora's birth name is Joan Paladini.
Joan Rydell's birth name is Joan Reddell.
Joan Samuels's birth name is Joan Samuels.