diff --git a/mycaldav/models.py b/mycaldav/models.py
index 70b3917..307c913 100644
--- a/mycaldav/models.py
+++ b/mycaldav/models.py
@@ -235,6 +235,16 @@ class cls_caldav_client():
             self.format_data_event(event)
         return
 
+    def get_lastName_with_MC(self,search):
+        print(f"search équipage 1: {search}")
+        user = User.objects.get(username=f"mc{search}@clerc.ch")
+        last_name = user.last_name
+        all_user_with_same_last_name = User.objects.filter(last_name=last_name)
+        if len(all_user_with_same_last_name) > 1:
+            print(f"Multiple last_name found {last_name}")
+            last_name = f"{user.first_name[0]}. {last_name}"
+        return last_name
+
     def format_data_event(self,event):
         summary = event.vobject_instance.vevent.summary.value
         if Key_separator not in summary:
@@ -250,9 +260,8 @@ class cls_caldav_client():
         if "MC" not in equipage[0]: # check équipage 1
             team_1 = equipage[0].strip().replace('#', '')
             try:
-                print(f"search équipage 1: {team_1}")
-                user = User.objects.get(username=f"mc{team_1}@clerc.ch").last_name
-                equipage[0] = equipage[0].replace(team_1, f"MC{team_1} {user}")
+                last_name = self.get_lastName_with_MC(team_1)
+                equipage[0] = equipage[0].replace(team_1, f"MC{team_1} {last_name}")
                 updated = True
             except :
                 print(f"Error: mc{team_1}@clerc.ch @{summary}")
@@ -264,9 +273,8 @@ class cls_caldav_client():
         elif "MC" not in equipage[1]: # check équipage 2
             team_2 = equipage[1].strip().replace('#','')
             try:
-                print(f"search équipage 2: {team_2}")
-                user = User.objects.get(username=f"mc{team_2}@clerc.ch").last_name
-                equipage[1] = equipage[1].replace(team_2, f"MC{team_2} {user}")
+                last_name =  self.get_lastName_with_MC(team_2)
+                equipage[1] = equipage[1].replace(team_2, f"MC{team_2} {last_name}")
                 updated = True
             except :
                 print(f"Error: mc{team_2}@clerc.ch @{summary}")