Dullu (Nepali: दुल्लु) is an urban Municipality in Dailekh District of Karnali Province in Nepal.
At the time of the 2011 Nepal census former Dullu had a population of 30,457 people living in 5,861 individual households. After the reconstruction of local level authority in Nepal in 2017, the total area of the new Dullu municipality has 156.77 square kilometres (60.53 sq mi) and total population is now (as of 2011 Nepal census) 41,540.
Nepali (नेपाली, Nepālī, [ˈnepali]), is an Indo-Aryan language, belonging to the Indo-Iranian branch of the Indo-European language family, native to the Himalayan region of South Asia. It is the official and most-widely spoken language of Nepal, where it also serves as a lingua franca. Nepali has official status in the Indian state of Sikkim and in the Gorkhaland Territorial Administration semi-autonomous region of West Bengal, where it is the majority language. It is also spoken by about a quarter of Bhutan's population. Nepali also has a significant number of speakers in the Indian states of Arunachal Pradesh, Assam, Himachal Pradesh, Manipur, Meghalaya, Mizoram and Uttarakhand. In Myanmar it is spoken by the Burmese Gurkhas. The Nepali diaspora in the Middle East, Brunei, Australia and worldwide also use the language. Nepali is spoken by approximately 19 million native speakers and another 14 million as a second language.
Nepali is commonly classified within the Eastern Pahari group of the Northern zone of Indo-Aryan.The language originated from the Sinja Valley, Karnali Province then the capital city of the Khasa Kingdom around the 10th and 14th centuries. It developed proximity to a number of Indo-Aryan languages, most significantly to other Pahari languages. Nepali was originally spoken by the Khas people, an Indo-Aryan ethno-linguistic group native to the Himalayan region of South Asia. The earliest inscription in the Nepali language is believed to be an inscription in Dullu, Dailekh District which was written around the reign of King Bhupal Damupal around the year 981. The institutionalisation of the Nepali language arose during the rule of the Kingdom of Gorkha (later became known as the Kingdom of Nepal) in the 16th century. Over the centuries, different dialects of the Nepali language with distinct influences from Sanskrit, Maithili, Hindi, and Bengali are believed to have emerged across different regions of the current-day Nepal and Uttarakhand, making Nepali the lingua franca.