"Turkey; Republic of Turkey changed to Turkey; Republic of Türkiye"
https://www.gov.uk/government/publications/country-names/cou...
https://www.gov.uk/government/groups/the-permanent-committee...
There is the precedent of Burma/Myanmar, "Country name remains Burma reflecting common British English usage". Similarly for Cabo Verde, "Cape Verde had circulated a request for this form to be used, though UK has retained the common English usage for the country name".
However, it did recently change Swaziland to Eswatini and I know which one I'd vote for as being common usage.
The ISO codes are not always adopted verbatim. e.g. The UK gov list does not include Taiwan. ISO plays both sides, giving it a country code but calling it a province of China. On the other hand the UK does include Kosovo which is not an ISO country but is recognised as one by approx 50% of nations including the UK.
Other countries have similar national naming committees to the UK's PCGN, you can see a list here https://unstats.un.org/unsd/ungegn/nna/nna-committees/