Thread Starter
TTH247
(@tth247)
I found a pseudo-solution. The function apparently sorts by the authors’ nicenames. If you set their nicenames to “LastName FirstName”, then the list will alphabetized by last name even though the names appear as “FirstName LastName.”
The catch is that any other instances of the author’s name in your theme (e.g. at the bottom of a post) will likely be generated via the nicename format. So you’ll have to hard-code it as FirstName LastName.