diff --git a/podaac/merger/harmony/service.py b/podaac/merger/harmony/service.py
index 9dfe110f..2e1e981e 100644
--- a/podaac/merger/harmony/service.py
+++ b/podaac/merger/harmony/service.py
@@ -66,6 +66,9 @@ def process_catalog(self, catalog: Catalog):
         if len(items) == 0:
             return result
 
+        # # --- Get granule filepaths (urls) ---
+        netcdf_urls: list[str] = _get_netcdf_urls(items)
+
         # -- Process metadata --
         bbox = []
         granule_urls = []
@@ -85,7 +88,11 @@ def process_catalog(self, catalog: Catalog):
 
         # -- Perform merging --
         collection = self._get_item_source(items[0]).collection
-        filename = f'{collection}_merged.nc4'
+        first_granule_url = []
+        get_granule_url(items[0], first_granule_url)
+        first_url_name = Path(first_granule_url[0]).stem
+        f'{first_url_name}_{datetimes[1].isoformat()}_{collection}_merged.nc4'
+        filename = f'{collection}_{datetimes[0].isoformat()}-{datetimes[1].isoformat()}_merged.nc4'
 
         with TemporaryDirectory() as temp_dir:
             self.logger.info('Starting granule downloads')