The Acehnese language is widely spoken within the Acehnese population. This is a member of the Aceh-Chamic group of languages, whose other representatives are mostly found in Vietnam and Cambodia, and is also closely related to the Malay group of languages. Achenese has many words borrowed from Malay and Arabic and traditionally was written using Arabic script. Acehnese is also used as local language in Langkat and Asahan (North Sumatra), and Kedah (Malaysia), and once dominated Penang. Alas and Kluet are closely related languages within the Batak group. The Jamee language originated from Minangkabau language in West Sumatra, with just a few variation and differences.
Aceh was once a meeting point for people from many nations, and among the present day Acehnese can be found some individuals of Arab, Turkish, and Indian descent. Before the tsunami, the region of Meureuhom Daya (Lamno) used to have an unusually high number of people with fair complexions, blue eyes and blond hair, and local traditions attributed to Turkish or Portuguese ancestry.