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Arctic tern (Sterna paradisaea)

The Arctic tern (Sterna paradisaea) is a tern in the family Laridae.
The breeding regions include the Arctic and sub-Arctic regions of Europe (as far south as Brittany), Asia, and North America.
This bird species is strongly migratory migrating from its northern breeding grounds to the Antarctic coast

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".

The specific paradisaea is from Late Latin paradisus, "paradise".

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").

Roseate tern (Nhàn hồng, Sterna dougallii)

The roseate tern (Sterna dougallii) is a species of tern in the family Laridae.

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".

"Roseate" refers to the bird's pink breast in breeding plumage.

Sterna is a genus of terns in the bird family Laridae.
Sterna is derived from Old English "stearn" which appears in the poem The Seafarer (1000 years after C.E).

1/ Common tern (Nhàn, Sterna hirundo) 
The Latin for swallow is hirundo, and refers here to the tern's superficial likeness to that unrelated bird, which has a similar light build and long forked tail. This leads to the informal name "sea swallow".

2/ Black-bellied tern (Nhàn bụng đen, Sterna acuticauda)

3/ Roseate tern (Nhàn hồng, Sterna dougallii)

4/ Black-naped tern (Nhàn Xumatra, Sterna sumatrana)