It's actually all based on the metadata, and the sorting will vary, depending on who did the original e-book and how much care they took with it.
Conversions from ePub usually need fixing, especially if the dc:author element in the OPF doesn't have a "file-as" attribute.
You can also add additional authors by separating the names with a semicolon, e.g. "Author, First; Author, Second", and they'll show up on the Kindle as "First Author & Second Author" and sort under "Author".
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