Only set namespace prefix when using FieldNameTag

validator.go

@@ -487,8 +487,11 @@ func (v *Validate) tranverseStruct(topStruct reflect.Value, currentStruct reflec
 
 	if useStructName {
 		errPrefix += sName + "."
+
+		if v.fieldNameTag != "" {
 			nsPrefix += sName + "."
 		}
+	}
 
 	// structonly tag present don't tranverseFields
 	// but must still check and run below struct level validation