Oriental dwarf kingfisher, also known as the black-backed dwarf kingfisher or three-toed kingfisher, is a bird in the family Alcedinidae. 
(Bồng chanh đỏ, Ceyx erithaca)
Ceyx: Ancient Greek Κήϋξ (Kḗüx, “Ceyx, a king from Greek mythology who was transformed into a kingfisher”).
erithaca: New Latin, from Greek erithakos, a bird, probably the robin. 
erithacus: meaning "robin" and hence "red-breasted".