My advice would be to use creativity to stick to legitimate concepts. Amazon is not stupid and would likely figure this trick out. Moreover, it would not surprise me if this would violate their agreement, even if the person's last name was truly Amaxon. If you ever got hit with a UDRP or court proceeding, it would be unethical for a to represent you and permit you to allege false facts about the person's name.
The trickier question is whether you could use a name like Amaxon.com for a bona fide site about the Amazon River, and sell merchandise there that relates to the river and South America and, perhaps, ultimately leads to a site that sells books.