←
Proto-Mon-Khmer *kulʔ (inherited)
←
Proto-Mon-Khmer *kəl( ) (mention)
←
Proto-Mon-Khmer *kəəlʔ (mention)
←
Proto-Mon-Khmer *-kuul (inherited)
←
Vietnamese cúi (mention)
←
Vietnamese gúi (mention)
←
Vietnamese gối (mention)
→
Vietnamese gối (mention)