Western Yellow Wagtail 
(Motacilla flava, Chìa vôi vàng Phuong Tay)

The western yellow wagtail (Motacilla flava) is a small passerine bird in the wagtail family Motacillidae.

Passeriformes, Passerina, passerina: Latin passerinus sparrow-like, (i.e. sparrow-sized) (passer sparrow).
Motacillidae, Motacilla: From Latin motacilla (“wagtail”), the word is a diminutive of motare, "to move about".
The specific flava is Latin for golden-yellow.