Van der haak & Woykos (1987-1988) identified two major Kui varieties in Surin and Sisaket provinces of eastern Thailand, Kuuy and Kuay.

Van der haak & Woykos also identified the following divergent Kui varieties in Sisaket Province, Thailand.

[2] Mann & Markowski (2005) reported the following four Kuy dialects spoken in north-central Cambodia.

[3] The Nyeu of Ban Phon Kho claim that their ancestors had migrated from Muang Khong, Amphoe Rasisalai, Sisaket Province.

The following is the phonology of the Kui (Surin) language:[5] Vowel sounds may also be distinguished using breathy voice: The following list of Kuy village locations in Sisaket Province is from Van der haak & Woykos (1987-1988:129).