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It has something to do with a mistranslation in the game; Aerith is actually the correct translation of the name. I think it's because that a "th" in Japanese is similar to an "s" and the name in Japanese is "Earisu" so it's one of the few translation mistakes the English versions of the games have. She is called "Aerith" in all future Final Fantasy VII projects.
Also, Aerith was the original name because it is close to the word "earth."
If you watch the summary feature on the DVD with the subtitles, her name is given as "Aerith" also. Edit (Coming Soon)
Most of them are; Steve Burton and Christy Carlson Romano both play Cloud and Yuffie. Cid is not given a voice in KH1 but Chris Edgerley voices him in KH2. Also, Mandy Moore does not play Aerith in this, instead it's Mena Suvari who has the role in KH2. Lance Bass doesn't voice Sephiroth like he did in KH1, but rather it's George Newbern (a.k.a. Nooj in X-2), whom also voices him in KH2. Rachel Leigh Cook plays Tifa in this and KH2. Edit (Coming Soon)