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

1/ Pied kingfisher (Bói cá nhỏ, Ceryle rudis)
The pied kingfisher (Ceryle rudis) is a species of water kingfisher widely distributed across Africa and Asia.

Alcedo, Alcedinidae: Latin word for kingfisher. 
The 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.

Pied kingfisher 
(Bói cá nhỏ, Ceryle rudis)

The pied kingfisher (Ceryle rudis) is a species of water kingfisher widely distributed across Africa and Asia.

Alcedo, Alcedinidae: Latin word for kingfisher. 
The 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.
The specific epithet rudis is Latin for "wild" or "rude".