Given that Google maps has renamed the Gulf of Mexico (for USA users), why is “Londonderry” displayed for those in the Republic?

As far as I know there is no recognition of the name Londonderry by the Irish state, all road signs display Derry/Doire only.

So by the rules of google Maps, should the city not appear as Derry in the Republic and Londonderry/Derry in the North?