[unboggling]

Welcome to Mobile Read. Try the third-party plugin Quality Check, available through Preferences/Plugins. Click the Get New Plugins button on the bottom in Prefs/Plugins and look at uninstalled plugins. Install Quality Check.

Search for all books with the comma in authors. In Quick Search box at top type:

author:,

Select all those books. Two methods to proceed:

1. Use Quality Check, Fix menu, Swap Author command. Or (more complicated):

2. Use Edit Metadata in Bulk, Search and Replace Tab, regular expression mode to switch elements around the comma.

Search field: authors

Search for:

(.+), (.*)

Replace with:

\2 \1

Look at the test results. Click the save button, name it something like LN, FN --> FN LN.

Note: that will mess up any authors with ", Jr" after last name, but then you can fix those after searching for "author:Jr".