The Xhosa people are a an African ethnic group of about 8 million people. Most of them living in south-east South Africa.
Wikipedia:Xhosa
Their language, one of the official languages of South Africa, is famous for her twelve different click consonants, even the X in the word xhosa is a click consonant. It is pronounced with a sideways click of the teeth - the same noise some people make when urging on a horse.
Wikipedia:Xhosa_language