I changed a bunch of file names in Bidge using Batch rename. The changes appear in bridge and Finder, but not Lightroom. Is there a way to get Lightroom to see the new name?
I think you'd have to import the photos again, after the name change (which could possibly cause you to lose any edits made in Lightroom, and possibly also lose metadata assigned in Lightroom).
Lightroom is not a file browser. Therefore, as a general principle, once you import photos into Lightroom, you need to do all photo management inside of Lightroom and not using your operating system nor another program.