As of revision version #85, OpenStreetMap has the following tags for Golfo de México:

  • name:en Gulf of Mexico
  • official_name:en-US Gulf of America
  • qaz
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    77 hours ago

    To reiterate, GNIS and GNS are only relevant to an appropriately qualified official_name tag, not a name tag, because of the on the ground rule. For this kind of feature, common sense would place a lot of weight on overall common usage, since sending someone to survey the facts “on the ground” would be… difficult.

    Yeah that certainly seems difficult