For Starters (12/3)

I'm thinking of a well-known person with three names. The first three letters in each of this person's name follow a peculiar pattern: exactly one letter differs between the first and second set of three letters and between the second and third set of three letters.

For example, in the name JOSEPH MOSES MISHRAM, the sets of letters JOS, MOS, and MIS follow the pattern.

Hint: The person is an author.

Who is this person?


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