User blog comment:Animefan0/hunter x hunter movie other names/@comment-4924732-20130113012826

There's just bad translations all around.

The Japanese title is 緋色の幻影, "Hiiro no Genei," which is literally "The Scarlet Phantom," and is in reference to the Phantom Troupe (幻影旅団, "Genei Ryodan")

However, the movie's Japanese title also has the subtitle ファントム・ルージュ, "Phantom Rouge." Rouge is obviously a reference to the Scarlet Eyes, and to me seems like a faulty translation for 緋色 (scarlet); however, since it is the official title, and is technically in English, this title is being used universally.