The water kingfishers or Cerylinae are one of the three subfamilies of kingfishers, and are also known as the cerylid kingfishers.

1/ Crested kingfisher (Bói cá mào or Bói cá lớn, Megaceryle lugubris) 

Alcedo, Alcedinidae: Latin word for kingfisher. 
Megaceryle is from the Ancient Greek megas, "great", and the existing genus Ceryle which is from Greek kerulos bird mentioned by Aristotle,.. but not further identified but probably mythical and associated with the halcyon, a kingfisher.