User blog comment:TheUntitled1/RWBY Episode 1 Japanese Dub Preview/@comment-86.61.21.122-20151111185201/@comment-11188061-20151111234704

If they just call her Red it will be 'Aka-chan', which is the Japanese definition of a baby. It'll distort the meaning too much, which is why they leave it at 'Aka Zukin chan'..