The game's Japanese title needs an English localization, because its Japanese title Ni no Kuni: Shiroki Seihai no Jyoou is a mouthful in English.
According to a U.S. government trademark registration by Level-5, the game does have an English language title. It is Ni no Kuni: Wrath of the White Witch.
Hooray for alliteration!
Kotaku is following up with Level-5.