diff --git a/src/components/call-desk/appointment-form.tsx b/src/components/call-desk/appointment-form.tsx
index acb5bc8..53bdc77 100644
--- a/src/components/call-desk/appointment-form.tsx
+++ b/src/components/call-desk/appointment-form.tsx
@@ -286,13 +286,17 @@ export const AppointmentForm = ({
                 const trimmedName = patientName.trim();
                 const nameChanged = isNameEditable && trimmedName.length > 0 && trimmedName !== initialLeadName;
 
-                // DO NOT update the shared Patient entity when name changes
-                // during appointment creation. The Patient record is shared
-                // across all appointments — modifying it here would
+                // Update patient name only when it was empty (new caller with no name).
+                // Don't overwrite an existing patient name — that would
                 // retroactively change the name on all past appointments.
-                // The patient name for THIS appointment is stored on the
-                // Appointment entity itself (via doctorName/department).
-                // Bug #527: removed updatePatient() call.
+                // Bug #527: only set name on patients with no existing name.
+                if (nameChanged && patientId && initialLeadName.length === 0) {
+                    const nameParts = { firstName: trimmedName.split(' ')[0], lastName: trimmedName.split(' ').slice(1).join(' ') || '' };
+                    apiClient.graphql(
+                        `mutation($id: UUID!, $data: PatientUpdateInput!) { updatePatient(id: $id, data: $data) { id } }`,
+                        { id: patientId, data: { fullName: nameParts } },
+                    ).catch((err: unknown) => console.warn('Failed to update patient name:', err));
+                }
 
                 // Update lead status/lastContacted on every appointment book
                 // (those are genuinely about this appointment), but only