The term "Rastafari" derives from "Ras Tafari Makonnen", the pre-regnal title of Haile Selassie, the former Ethiopian emperor who occupies a central role in Rasta belief. The term "Ras" means a duke or prince in the Ethiopian Semitic languages; "Tafari Makonnen" was Selassie's personal name. It is unknown why the early Rastas adopted this form of Haile Selassie's name as the basis of the term for their religion. As well as being the religion's name, "Rastafari" is also used for the religion's practitioners themselves. Many commentators—including some academic sources and some practitioners—refer to the movement as "Rastafarianism". However, the term is disparaged by many Rastafari, who believe that the use of -ism implies religious doctrine and institutional organisation, things they wish to avoid.
Ras (Amharic: ራስ, romanized: ras, lit. 'head' compare with Arabic Rais or Hebrew Rosh), is a royal title in the Ethiopian Semitic languages. It is one of the powerful non-imperial titles.
Historian Harold G. Marcus equates the Ras title to a duke;[citation needed] others have compared it to "prince".
The combined title of Leul Ras (Amharic: ልዑል ራስ) was given to the heads of the cadet branches of the Imperial dynasty, such as the Princes of Gojjam, Tigray, Ras Tafari Makonnen and the Selalle sub-branch of the last reigning Shewan Branch, and meaning "Lord of Lords", the highest title of lord.