In CC Illustrator 2023 how do I create a Script to export each layer name as PDF name?

I presume you want each layer saved as different PDFs and not all layers saved as the same PDFs but with different names. The script may be slow running, so test before running on a heavy document.

function main() {
    var folder1 = Folder.selectDialog();
    var doc1 = app.activeDocument;

    for (var i = 0; i < doc1.layers.length; i++) {
        app.selection = null;

        var layer1 = doc1.layers[i];
        layer1.hasSelectedArtwork = true;
        var selection = doc1.selection;
        
        var doc2 = app.documents.add();
        for (var j = 0; j < selection.length; j++) {
            selection[j].duplicate(doc2, ElementPlacement.PLACEATEND);
        }

        var PDF1 = new PDFSaveOptions();
        var name1 = layer1.name;
        var file1 = new File(folder1 + "/" + name1);
        doc2.saveAs(file1, PDF1);
        doc2.close(SaveOptions.DONOTSAVECHANGES);
    }
}

main();