ธิดา (Thai) comes from Sanskrit धीता, from Pali dhītā, from Sanskrit धयति, from Proto-Indo-Aryan dʰáyati, from Proto-Indo-Iranian dʰáyati, from Proto-Indo-European dʰéh₁(y)-e-ti, from Proto-Indo-European dʰeh₁(y)- — to suckle, nurse.
ธิดา (Thai): daughter