Red knot or just knot 
(Rẽ lưng nâu, Calidris canutus)

The red knot or knot (Calidris canutus) is a shorebird of the family Scolopacidae for sandpipers and plovers.
The bird species breeds in the far north of Canada, Europe, and Russia.
Red Knot is a pass-through winter bird commonly sighted at the Xuan Thuy National Park Vietnam.

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.

Canutus is a Latin word, meaning "grey-haired" or "grizzled," derived from Latin roots (Cānūtus) for "grey" or "white" often used in Late Latin as an adjective describing someone with gray hair.