The name "Mohican" was used by Europeans to refer to two related but distinct tribes, the Mohegan and the Mahican. To avoid confusion, "Mohican" is generally not used to refer to either tribe anymore; the spellings "Mohegan" and "Mahican" are the most accepted now. (For what it's worth, James Fenimore Cooper's "Last of the Mohicans" was about the Mohegans.)