Jim is not called "Nigger Jim" in Huckleberry Finn

FromList of Tom Sawyer characters - Wikipedia:

The words "nigger" and "Jim" appear side-by-side only once inAdventures of Huckleberry Finn, in Chapter XXXI, in a letter Huck writes to Mrs. Watson, but they are not used as a name. After "nigger Jim" appeared inAlbert Bigelow Paine's1912 Clemens biography, it continued to be used by twentieth-century critics, includingLeslie Fiedler,Norman