ဒုတိယ (Mon) comes from Pali dutiya, from Sanskrit द्वितीय, from Proto-Indo-Aryan dwitíyas, from Proto-Indo-Iranian dwitíyas, from Proto-Indo-European dwitíyos, from Proto-Indo-European dwi-, from Proto-Indo-European dwóh₁ — two.
ဒုတိယ (Mon): second