From Proto-Tai *C̥.dokᴰ (“catfish”). Cognate with Lao ດຸກ (duk), Northern Thai ᨯᩩᨠ, Khün ᨯᩩᨠ, Lü ᦡᦳᧅ (ḋuk), Shan လုၵ်း (lúk).
ดุก • (dùk) (classifier ตัว)