Laven language
Laven is a Mon–Khmer dialect cluster of southern Laos. Laven is the exonym given by the Laotian government, while the autonym of many of those speakers is Jru' [ɟruʔ]. Varieties are:
Jru' (also spelled Jruq)
Juk
Su' (also spelled Suq)
Laven varieties are described in detail by Therapan L-Thongkum and Paul Sidwell (2003).
References
Sidwell, Paul (2003). A Handbook of comparative Bahnaric, Vol. 1: West Bahnaric. Pacific Linguistics, 551. Canberra: Research School of Pacific and Asian Studies, Australian National University.