Ashy drongo 
(Chèo bẻo xám, Dicrurus leucophaeus)

The ashy drongo (Dicrurus leucophaeus) is a species of bird in the drongo family Dicruridae.

Dicruridae or Dicrurus is derived from the Greek words dikros meaning forked, ouros meaning tailed.
Leucophaeus, leucophaeus, leucophaius Greek: leukophaios whitish-grey, ash-coloured (leukos, white; phaios dusky)
Greek phaes meaning "eyes" or "face".