The famous coffee beverage Moka takes its name from a town in Yemen called Moka. The pronounciation of the Arabic letter "KH" is unkown to most of the western world. So moka is correctly pronounced Mokha. make a K sound from the back of your throat as if you were spitting. That's the correct pronounciation.
Yemen is known for its high quality coffee beans, coffee is a major exporting business in Yemen.