From Proto-Mon-Khmer*kɟaːiʔ. Possible cognates include Thocaːj³(banana), Hungcaːj(banana), Muongcuoj³(banana), Vietnamesechuối(banana), Ngeqcallɔk(trunk or edible center of banana tree), Khmukɟɔːk(type of banana), Semaiɟai(a wild inedible banana), Temiarɟai(a wild inedible banana), Jehaiɟaj(banana), Thaiหยวก(jùːak, “trunk of banana tree”).