From Proto-Tai *napᴰ (“to count”).
Cognate with Thai นับ (náp), Northern Thai ᨶᩢ᩠ᨷ, Lü ᦓᧇ (nab), Tai Dam ꪙꪚꪾ, Shan ၼပ်ႉ (nâ̰p), Phake ꩫပ် (nap, “to calculate”), Ahom *𑜃𑜆𑜫 (*nap).
ນັບ • (nap) (abstract noun ການນັບ)