diff --git a/src/calibre/library/catalogs/csv_xml.py b/src/calibre/library/catalogs/csv_xml.py
index 0cc8b4d298..ca6209392c 100644
--- a/src/calibre/library/catalogs/csv_xml.py
+++ b/src/calibre/library/catalogs/csv_xml.py
@@ -118,7 +118,10 @@ class CSV_XML(CatalogPlugin):
                     if field.startswith('#'):
                         item = db.get_field(entry['id'], field, index_is_id=True)
                         if isinstance(item, (list, tuple)):
-                            item = ', '.join(item)
+                            if fm.get(field, {}).get('display', {}).get('is_names', False):
+                                item = ' & '.join(item)
+                            else:
+                                item = ', '.join(item)
                     elif field == 'library_name':
                         item = current_library
                     elif field == 'title_sort':