Talk:List of ponies/@comment-201.188.81.169-20130625215014/@comment-64.118.119.131-20130625220429

According to this and this, even the game's internal code doesn't call Twilight's Dad "Night Light"—apparently "Night Light Book Binding House" is only the name of his and Twilight Velvet's in-game building, which by itself doesn't seem to give him any name. And I doubt that it's cannon, since it'd be pretty difficult to shoot a cannonball out of a book binding house.