Once in a language classroom in London an Iranian student pointed to the Gulf on a wall map, saying 'Persian Gulf', whereupon an Iraqi student leapt up to say it was the 'Arabian' Gulf, initiating an argument that very nearly developed into a fistfight.
The mouth of the Strait is an international waterway overseen 50/50 between Iran and Oman, surely, or 50% by Iran to the east and 50% split between seven Arab countries to the west.