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					Originally Posted by  kovidgoyal
					 
				 
				The mobi format supports only an author field, no author sort. I don't recall if calibre sets this field from author or author sort information, should be easy to check 
			
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 Yes, that was it.  If I set the author field to "Lastname, Firstname" in Calibre then when I send the book to the Kindle, it's sorted properly under "Lastname, Firstname" but is displayed on the Kindle home page as "Firstname Lastname".  Perfect; that's what I wanted.
Often the best solution turns out to be the simplest.  Thank you, Kovid (and William of Ockham).  Now I have to go through all my books in Calibre and reverse the author names...