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If you right-click on any author in the Book Details pane, there is an option to "Manage %s" -- use that to go to Manage Authors, and one of the tools there lets you "Recalculate all author sort values".
All "author" values of "FN LN" should be copied over as "LN, FN" to "author_sort".
I don't know if there are different rules for calibre calculating the sort value on non-English words, but this works great for English books where the metadata is imported wrongly (stupid publishers/vendors use FN LN for both author and author_sort).
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