Is that the proper name for Asusvivobook 15 x140v laptop, is Asusvivobook 15 (x1504) laptop

The proper name for the laptop you're referring to is generally **Asus Vivobook 15 (X1504)**. It’s common for manufacturers to use a naming convention that includes a series name (like "Vivobook 15") followed by a specific model number (in this case, "X1504"). The designation "X140V" does not appear to correspond to the most widely recognized model naming conventions for the Vivobook series. If you're looking for specific specifications or features, it's always a good idea to check the Asus official website or the packaging of the laptop for the exact model number.