From Proto-Southwestern Tai *ˀdɛːnᴬ³ (“boundary; border”). Cognate with Thai แดน (dɛɛn), Lao ແດນ (dǣn), Lü ᦶᦡᧃ (ḋaen), Tai Nüa ᥘᥦᥢ (laen), Phake ꩫိꩫ် (nin), Ahom *𑜓𑜢𑜐𑜫 (*diñ), 𑜃𑜢𑜐𑜫 (niñ).
လႅၼ် • (lěn)