Used in most of the maps from long time ago so there is no need to change the name.
It has been and will always remain the Persian GulfUsed by United Nations in their documents
It's a historical name On almost all maps printed before 1960, and in most modern international treaties, documents and maps, this body of water is known as the "Persian Gulf".
Arabian gulf means the Red Sea so the "Arabian gulf" name may create confusion with the Red sea so it's better to use the name Persian gulf
If the Arabian Gulf gets it's name from the fact that more Arab countries are surrounding it, then India Ocean should also change its name because India has a smaller border with it than other countries.