Proto-Mon-Khmer *kt₁aam

→ Khmer ក្ដាម (inherited)

→ Mon ဂတာံ (inherited)

→ Malay ketam (cognate)

→ Pnar tham (derived)

→ Semai kantéém (inherited)

→ Urak Lawoi' เกอตับ (cognate)

→ Vietnamese dam (inherited)

→ Vietnamese sam (inherited)

→ Vietnamese đam (inherited)

→ Chinese 蟳 (cognate)

→ Mang taːm⁶ (inherited)