Interestingly enough, Persian Gulf is actually used as a TAG in this article.

The following are links to the United Nations Geographical maps of the world and the Persian Gulf region. Please take time to view them and notice that the UN refers to this body of water as the Persian Gulf.

http://www.un.org/Depts/Cartographic/map/profile/iran.pdf
http://www.un.org/Depts/dhl/maplib/docs/escwa.pdf
http://www.un.org/Depts/Cartographic/map/profile/qatar.pdf

Most importantly, the United Nations with 22 Arab member states has on two occasions officially declared the name of the waterway to the south of Iran as the Persian Gulf. The first announcement was made through the document UNAD, 311/Qen on March 5, 1971, and the second was UNLA 45.8.2 section C, on August 10, 1984. Persian Gulf is also the recognized name by the British Permanent Committee on Geographical Names (PCGN).

I’ve submitted the above links in order to support this position and clear any confusion as to what to call the Persian Gulf. I also hope this has been only an unfortunate oversight and that it will be corrected immediately. I look forward to your reply and thank you for your attention to this important matter.

Please contact me if you need more information with regards to this topic.

Sincere Regards
Saeed Tasbihsazan