About Siswati: Siswati language is the official language of Swaziland. It is a Southern African language mainly spoken in Swaziland and South Africa. According to the census 2001 of South African, the speakers of Siswati is 1,194,428. The Siswati language is related to isiXhosa, isiZulu and isiNdebele. Siswati language is a tonal language.