Official and secondary sources may differ because country and area names can change more often than the numerical codes used to identify them. A mismatch should therefore be checked name by name and code by code rather than treated automatically as an error.
What the official source establishes
The UN Statistics Division’s UN M49 documentation makes two relevant points:
- Changes to country and area names are more frequent than changes to their codes.
- M49 names are based on the United Nations Terminology Database, known as UNTERM.
These points provide one possible explanation for divergence: a secondary source may retain an earlier name while continuing to use an unchanged numerical code. The cited material does not establish that every secondary source follows UNTERM, or that every difference in wording indicates a mistake.
How to check a mismatch
- Compare the exact name. Record the wording rather than assuming that similar labels are interchangeable.
- Check the numerical code separately. A matching code does not by itself confirm that the accompanying name is current.
- Look for the secondary source’s naming basis. Check whether it says it follows M49, another terminology standard, or its own editorial conventions.
- Compare publication or revision information. An older source may reflect terminology from an earlier point, although its date alone does not prove that a name is obsolete.
- Consult the terminology basis when needed. UN M49 identifies UNTERM as the basis for its names, making it the relevant terminology reference for further checking.
What still requires confirmation
No particular secondary publication or disputed country or area name is analysed here, so the cause of a specific mismatch cannot be determined in advance. Readers must still confirm the current M49 entry, the secondary source’s publication date and stated naming basis, and whether the numerical code was transcribed correctly before deciding whether the disagreement reflects a naming change, a different convention, or an error.