If I recall correctly, the time zone names come from the IANA registry, so there is precedent.

On Thu, 7 Jan 2021 at 19:54, Tom Honermann via Std-Proposals <std-proposals@lists.isocpp.org> wrote:
Copying the SG16 mailing list...

Tom.

On 1/7/21 1:53 PM, Florian Weimer via Std-Proposals wrote:
> This proposal suggests to use the IANA Character Sets Registry.
>
> I had some concerns about the state of the registry, but I have been
> able to register the UTF-7-IMAP charset recently.  It may have helped
> that it was specified in RFC 3501 in 2003 (but the corresponding IANA
> action had been omitted), and it is still in wide use today, without a
> deployed alternative.  However, the basic process appears to be working,
> including MIB assignment.
>
> I can't comment on the feasibility from a ISO process perspective of
> using the IANA registry.  ISO has its own character set registries,
> somewhere in the context of ISO 2022 and ISO 4873.  It may be a
> nonnegotiable requirement that an ISO standard uses an existing ISO
> registry.
>
> Thanks,
> Florian


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