diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/QueryHandlers/GetContactsByLastNameAndDateOfBirthHandler.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/QueryHandlers/GetContactsByLastNameAndDateOfBirthHandler.cs
index d2ee4a233..48c837beb 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/QueryHandlers/GetContactsByLastNameAndDateOfBirthHandler.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/QueryHandlers/GetContactsByLastNameAndDateOfBirthHandler.cs
@@ -8,10 +8,6 @@ public class GetContactsByLastNameAndDateOfBirthHandler : ICrmQueryHandler<GetCo
 {
     public async Task<Contact[]> Execute(GetContactsByLastNameAndDateOfBirthQuery query, IOrganizationServiceAsync organizationService)
     {
-        var lastNameFilter = new FilterExpression(LogicalOperator.Or);
-        lastNameFilter.AddCondition(Contact.Fields.LastName, ConditionOperator.Equal, query.LastName);
-        lastNameFilter.AddCondition(Contact.Fields.dfeta_PreviousLastName, ConditionOperator.Equal, query.LastName);
-
         var queryExpression = new QueryExpression(Contact.EntityLogicalName)
         {
             ColumnSet = query.ColumnSet,
@@ -25,7 +21,14 @@ public async Task<Contact[]> Execute(GetContactsByLastNameAndDateOfBirthQuery qu
                 },
                 Filters =
                 {
-                    lastNameFilter
+                    new FilterExpression(LogicalOperator.Or)
+                    {
+                        Conditions =
+                        {
+                            new ConditionExpression(Contact.Fields.LastName, ConditionOperator.Equal, query.LastName),
+                            new ConditionExpression(dfeta_previousname.EntityLogicalName, dfeta_previousname.Fields.dfeta_name, ConditionOperator.Equal, query.LastName)
+                        }
+                    }
                 }
             },
             Orders =
@@ -33,11 +36,34 @@ public async Task<Contact[]> Execute(GetContactsByLastNameAndDateOfBirthQuery qu
                 new OrderExpression() { AttributeName = Contact.Fields.LastName },
                 new OrderExpression() { AttributeName = Contact.Fields.FirstName },
                 new OrderExpression() { AttributeName = Contact.Fields.dfeta_TRN },
+            },
+            LinkEntities =
+            {
+                new LinkEntity(
+                    Contact.EntityLogicalName,
+                    dfeta_previousname.EntityLogicalName,
+                    Contact.PrimaryIdAttribute,
+                    dfeta_previousname.Fields.dfeta_PersonId,
+                    JoinOperator.LeftOuter)
+                {
+                    LinkCriteria = new FilterExpression()
+                    {
+                        Conditions =
+                        {
+                            new ConditionExpression(dfeta_previousname.Fields.dfeta_Type, ConditionOperator.Equal, (int)dfeta_NameType.LastName),
+                            new ConditionExpression(dfeta_previousname.Fields.StateCode, ConditionOperator.Equal, (int)dfeta_previousnameState.Active)
+                        }
+                    }
+                }
             }
         };
 
         var response = await organizationService.RetrieveMultipleAsync(queryExpression);
 
-        return response.Entities.Select(e => e.ToEntity<Contact>()).ToArray();
+        return response.Entities
+            .Select(e => e.ToEntity<Contact>())
+            .GroupBy(c => c.Id)
+            .Select(g => g.First())
+            .ToArray();
     }
 }