diff --git a/stix2/v21/common.py b/stix2/v21/common.py
index 4a71308..cf3a3b3 100644
--- a/stix2/v21/common.py
+++ b/stix2/v21/common.py
@@ -150,6 +150,7 @@ class MarkingDefinition(_STIXBase, _MarkingsMixin):
         ('object_marking_refs', ListProperty(ReferenceProperty(valid_types='marking-definition', spec_version='2.1'))),
         ('granular_markings', ListProperty(GranularMarking)),
         ('definition_type', StringProperty(required=True)),
+        ('name', StringProperty()),
         ('definition', MarkingProperty(required=True)),
     ])
 
@@ -207,6 +208,7 @@ TLP_WHITE = MarkingDefinition(
     id='marking-definition--613f2e26-407d-48c7-9eca-b8e91df99dc9',
     created='2017-01-20T00:00:00.000Z',
     definition_type='tlp',
+    name='TLP:WHITE',
     definition=TLPMarking(tlp='white'),
 )
 
@@ -214,6 +216,7 @@ TLP_GREEN = MarkingDefinition(
     id='marking-definition--34098fce-860f-48ae-8e50-ebd3cc5e41da',
     created='2017-01-20T00:00:00.000Z',
     definition_type='tlp',
+    name='TLP:GREEN',
     definition=TLPMarking(tlp='green'),
 )
 
@@ -221,6 +224,7 @@ TLP_AMBER = MarkingDefinition(
     id='marking-definition--f88d31f6-486f-44da-b317-01333bde0b82',
     created='2017-01-20T00:00:00.000Z',
     definition_type='tlp',
+    name='TLP:AMBER',
     definition=TLPMarking(tlp='amber'),
 )
 
@@ -228,5 +232,6 @@ TLP_RED = MarkingDefinition(
     id='marking-definition--5e57c739-391a-4eb3-b6be-7d15ca92d5ed',
     created='2017-01-20T00:00:00.000Z',
     definition_type='tlp',
+    name='TLP:RED',
     definition=TLPMarking(tlp='red'),
 )