@Mathias It was "Philosopher's Stone" when the book was released in the UK. When it was released in the US, it was thought nobody would understand the reference, so they changed it to "Sorcerer's Stone".
"Scholastic's Arthur Levine thought that "philosopher" sounded too archaic for US readers"
@Mathias They didn’t. The British/ European version was always titled The Philosopher’s Stone. The US version was different/ changed to the Sorcerer’s Stone