Black-naped tern 
(Nhàn Xumatra, Sterna sumatrana)

The black-naped tern (Sterna sumatrana) is an oceanic tern mostly found in tropical and subtropical areas of the Indian Ocean and western Pacific Ocean.
The black-naped tern inhabits rocky shores throughout the Western-Pacific and Indian oceans, migrating yearly.

Charadriiformes, 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").

Laridae:from Ancient Greek laros or Latin larus, which appears to have referred to a gull or other large seabird.

The genus name Sterna is derived from Old English "stearn", "tern".

Sumatrana is a Latinized, neo-Latin specific epithet meaning "of or from Sumatra" (an island in Indonesia). 
The root name "Sumatra" originates from the Sanskrit word samudra, meaning "sea" or "ocean". 
-ana: A Latin feminine singular suffix (from -anus) used to denote origin, location, or possession (e.g., "belonging to Sumatra").