How Maritime geographical bodies of waterways are named.

RESOLUTION 8
“Treatment of Names of Features beyond a Single Sovereignty”
It included the consideration that it is preferable that a common name or application be
established, wherever practical, in the interest of international standardization and
recommended that the geographical names authorities of the nations concerned attempt to reach
agreement on these conflicting names or applications. It further recommended that the UN
Permanent Commission on Geographical Names should obtain from the IOC
(Intergovernmental Oceanographic Commission), the IHB, and the International Association
for Physical Oceanography (IAPO) full particulars of the work already accomplished by these
organizations.
However, inspite of the recommendations of the above Resolution 8, that attempts be
made to reach agreement on conflicting names, the IHO Member States felt that it was
necessary to have an “opt out” clause, should agreement not be possible. This has been
reflected in paragraph 6 of IHO Technical Resolution A 4.2 which states: “It is recommended
that where two or more countries share a given geographical feature (such as, for example, a
bay, a strait, channel or archipelago) under a different name form, they should endeavour to
reach agreement on fixing a single name for the feature concerned. If they have different
official languages and cannot agree on a common name form, it is recommended that the name
forms of the two languages in question should be accepted for charts and publications unless
technical reasons prevent this practice on small scale charts. e.g. English Channel/La Manche”.

https://icaci.org/files/documents/ICC_proceedings/ICC2001/icc2001/file/f04016.pdf

HERE is the link, or just research yourself.