Ruddy shelduck (Vịt vàng, Tadorna ferruginea), known in India as the Brahminy duck
formerly placed in the genus Anas. Some authorities place it in the genus Casarca.

The ruddy shelduck (Tadorna ferruginea) is a bird species in the family Anatidae.
The species is a migratory bird, wintering in the Indian subcontinent and breeding in southeastern Europe and central and eastern Asia; small resident populations found in North Africa. 

anser: Latin anser goose;
anas, anatis: Latin duck.
The genus Tadorna name comes from the French name Tadorne for the common shelduck.
The species name ferruginea is Latin for "rusty" and refers to the colour of the plumage.