The Ivorian government insists that Cote D'Ivoire should be used for all official purposes instead of translations in English and other languages. (taken from reddit). Yeah I'm a little bit lazy to search for some undeniable proofs
Countries government cannot decide about other languages. It's Ivory Coast. In Polish, for example, it's Wybrzeże Kości Słoniowej. Core d'Ivoire is only a French name.