Final answer:
For an individual with only one name, it is generally correct to enter their single name in the Last Name field, unless the system or form provides specific alternative instructions.
Step-by-step explanation:
When dealing with data entries for individuals who have only one name, it is important to follow the specific protocol or guidelines set by the organization or system you are using. However, in many cases, the appropriate action to take is to enter their single name in the Last Name field.
This is often done because databases and forms are typically designed to require a last name. If the system or form explicitly provides guidance for this scenario, such as entering "NA" or "Only One Name", you should follow those instructions. Absence of such instructions typically indicates that you should use the individual's name in the Last Name field.