The Mày is a small ethnic group of Vietnam, indigenous to the mountains of Central Vietnamese province of Quảng Bình.
[4] Early missionaries like Marius Maunier (1902) and Léopold Cadière (1905), due to limited contemporary knowledge, simply regarded the Mày as "des sauvages," (Moï or Rợ in Vietnamese).
Prior to the mid-20th century, the Mày had been nomadic hunter-gatherers in the wild Annamite mountains of western Quảng Bình like other Cheut groups.
Their lifestyle included ancient hunting, foraging, and fishing techniques using primitive tools such as stone daggers, bone knives, and crossbows.
Using conventional techniques, they grow maize, cassava, rice, and taro on hill paddy fields with crafted metal tools.
According to their mythology, Ku Lôông taught the May how to make weapons, especially bows and poisoned arrows, helping the Mày fight off beasts and enemy tribes.
One important Mày holiday is Sileng, which takes place in the second half of July and is ritualized with sacrifices in honor of the water serpent Kulong-Tavok.