From Proto-Tai *cramꟲ (“cave”). Cognate with Thai ถ้ำ (tâm), Lao ຖ້ຳ (tham), Northern Thai ᨳ᩶ᩣᩴ, Khün ᨳ᩶ᩣᩴ, Tai Dam ꪖꪾ꫁, Lü ᦏᧄᧉ (ṫham2), Tày thẳm, Shan ထမ်ႈ (thām), Ahom 𑜌𑜪 (thaṃ), Zhuang gamj. Related to Vietnamese thẳm.
ᥗᥛᥲ (thàm) (old orthography ᥗᥛ̀)