Dunlin (Rẽ trán trắng, Calidris alpina)
formerly placed in the genus Erolia.

Dunlin (Calidris alpina, Rẽ trán trắng) is a small wader, Scolopacidae family, Calidris genus.
The bird is a pass-through winter bird, commonly sighted at the Xuan Thuy National Park.

Charadriidae, Charadrius: Late Latin word for a yellowish bird mentioned in the fourth-century Vulgate; from Ancient Greek kharadrios a bird found in ravines and river valleys (kharadra, "ravine").

The word Scolopacidae is New Latin, derived from the genus name Scolopax (Latin for "snipe" or "woodcock") and the common zoological suffix for family names, -idae.

The genus name Calidris is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds.
The specific alpina is from Latin and means "of high mountains", in this case referring to the Alps.

The English name derives from dun, "dull brown", with the suffix -ling, meaning a person or thing with the given quality.