Northern Kurdish (کوردیا ژۆرین; kurdiya jorîn), also called Kurmanji (کورمانجی; Kurmancî), is a group of Kurdish dialects predominantly spoken in southeast Turkey, northwest Iran, northern Iraq and northern Syria. It is the most widespread dialect group of the Kurdish languages. While Kurdish is generally categorized as one of the Northwestern Iranian languages along with Baluchi, it also shares many traits with Southwestern Iranian languages like Persian, apparently due to longstanding and intense historical contacts, and some authorities have gone so far as to classify Kurmanji as a Southwestern or "southern" Iranian language.
Northern Kurdish dialects, which uses the Latin script, is the most common dialect group of the Kurdish language, spoken by 80% of all Kurds. The earliest textual record of the Kurdish language dates to the 16th century.
Kurmanji is the ceremonial language of Yezidism. The sacred book Mishefa Reş (the "Black Book") and all prayers are written and spoken in Kurmanji.
Kurdish (کوردی, Kurdî) is a continuum of Northwestern Iranian languages spoken by the Kurds in Western Asia. Kurdish forms three dialect groups known as Northern Kurdish (Kurmanji), Central Kurdish (Sorani), and Southern Kurdish (Pehlewani). A separate group of languages, Zaza-Gorani, is also spoken by several million Kurds, but is linguistically not Kurdish. Recent (as of 2009) studies estimate between 20 and 30 million native speakers of Kurdish in total.
The literary output in Kurdish was mostly confined to poetry until the early 20th century, when more general literature began to be developed. Today, there are two principal written Kurdish dialects, namely Kurmanji in the northern parts of the geographical region of Kurdistan, and Sorani further east and south. The standard Sorani form of Central Kurdish is, along with Arabic, one of the two official languages of Iraq and is in political documents simply referred to as Kurdish.
The Kurdish languages belong to the Iranian branch of the Indo-European family. They are generally classified as Northwestern Iranian languages, or by some scholars as intermediate between Northwestern and Southwestern Iranian.Martin van Bruinessen notes that "Kurdish has a strong south-western Iranian element", whereas "Zaza and Gurani [...] do belong to the north-west Iranian group".