I'm with Owl Eagle on this one. History Channel had a documentary on called "The Barbarians" (very good by the way) and they did a episode on Genghis Khan and every one of the talking head historians pronounced it the way Owl said.
It's hard to get worked up about the English spelling of foreign (other than English) names. Beijing/Peiping/Peiking; Koran/Quran; etc. Consider the way certain letters are pronounced differently in Mandarin, for example, than they would be in English. (XIN is pronounced SHIN; QING is pronounced CHING; etc.) To insist every foreign word be spelled phonetically isn't going to work. Especially, since there are sounds in some languages that we can't really duplicate precisely.