Calling anime by the Japanese name when there is an English title that is easier to remember is pointless. It annoys the hell out of me when people say Kuroshitsuji, when Black Butler has much better alliteration. In fact, the original title for "Ghost in the Shell" was "Mobile Riot Patrol Squad." When the movie was released in American theaters it was given the more appropriate and better sounding title: "Ghost in the Shell." The Japanese creator loved the new title so much that the Japanese movie and manga series were renamed.
The same action was taken by the creator of the "Fullmetal Alchemist" series. The original title was "Hagane no Renkinjutsushi." Would you rather say "Hagane no Renkinjutsushi" or "Fullmetal Alchemist?" Again, the Japanese creator preferred the English titles and since then the series, it's spin-off, and subsequent movies have all been released in Japan under the name "Fullmetal Alchemist."