Before the manga ended, I remember reading somewhere that part of the things that should be revealed by the end was Scar's name, but I don't recall ever finding it out. What's Scar's name, was it ever revealed?
His name was never revealed.
According to this:
In the first anime, Scar died without his name ever being revealed. However, the author planned to reveal Scar's name before the manga finishes (in the "extras" at the end of volume 15, Arakawa states she has a name for Scar, but it's a secret). In chapter 102, when Wrath asks Scar what his name is, Scar replies he has no name and abandoned it long ago. As of Chapter 108, Scar officially has no name, stating that after dying twice, he no longer exists. It is unknown if his name will ever be revealed.