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Aerodramus is a genus of small, dark, cave-nesting birds in the Collocaliini tribe of the swift family Apodidae.
The genus name combines the Ancient Greek aer meaning "air" with -dromos meaning "-racer" (from trekho "to run").

1/ Edible-nest swiftlet (Yến hông xám, Aerodramus fuciphagus), also known as the white-nest swiftlet

2/ Himalayan swiftlet (Yến núi, Aerodramus brevirostris) 

3/ Mossy-nest swiftlet (Yến rêu, Aerodramus salangana) 

Apodidae is a bird family of swifts which are highly aerial birds. 
The family name, Apodidae, is derived from the Greek apous meaning "footless", a reference to the small, weak legs of these most aerial of birds.

The bird genus Apus comprise some of the Old World members of the family Apodidae, commonly known as swifts.
The name Apus is Latin for a swift, thought to be a type of swallow with no feet (from Ancient Greek a meaning "without", and pous meaning "foot").

1/ Little swift (Yến cằm trắng, Apus affinis)

2/ Pacific swift or fork-tailed swift (Yến hông trắng, Apus pacificus)
pacificus refers to the Pacific Ocean.

Asian palm swift (Yến cọ, Cypsiurus balasiensis) 

The Asian palm swift (Cypsiurus balasiensis) is a small swift of the Apodidae family.
It is a common resident breeder in tropical Asia from India to the Philippines.

As the name apodiforme—meaning "footless" in Greek—suggests, the legs of hummingbirds, swifts and treeswifts (or 'crested' swifts) are rather small and offer limited functional uses.
The family name, Apodidae, is derived from the Greek ἄπους (ápous), meaning "footless", a reference to the small, weak legs of these most aerial of birds.
The genus name Cypsiurus comes from the Greek words kupselos (swallow) and ouros (tailed).
balasiensis from “Balasian Swift”, the name given to the Asian Palm, probably after the town and district of Balasore in the Bengal region.

Cypsiurus is a genus of the swift family of birds in the family Apodidae, of the order Apodiformes.

1/ Asian palm swift (Yến cọ, Cypsiurus balasiensis) 

As the name apodiforme—meaning "footless" in Greek—suggests, the legs of hummingbirds, swifts and treeswifts (or 'crested' swifts) are rather small and offer limited functional uses.
The family name, Apodidae, is derived from the Greek ἄπους (ápous), meaning "footless", a reference to the small, weak legs of these most aerial of birds.
The genus name Cypsiurus comes from the Greek words kupselos (swallow) and ouros (tailed).

Hirundapus is a genus of the swift family of birds in the family Apodidae, of the order Apodiformes.

1/ Silver-backed needletail (Yến đuôi cứng bụng trắng, Hirundapus cochinchinensis)

2/ White-throated needletail (Yến đuôi cứng họng trắng, Hirundapus caudacutus), also known as needle-tailed swift or spine-tailed swift
The specific name caudacutus comes from the Latin words cauda meaning "tail" and acutus meaning "pointed".

3/ Brown-backed needletail (Yến đuôi cứng lớn, Hirundapus giganteus), or brown needletail

As the name apodiforme—meaning "footless" in Greek—suggests, the legs of hummingbirds, swifts and treeswifts (or 'crested' swifts) are rather small and offer limited functional uses.
The family name, Apodidae, is derived from the Greek ἄπους (ápous), meaning "footless", a reference to the small, weak legs of these most aerial of birds.

The genus name Hirundapus is constructed from the names of the swallow genus Hirundo and the swift genus Apus.
Hirundo is a Latin word meaning swallow.
The word apus is Latin and derived from the Ancient Greek α, a ("without") and πளுக்கான, pous ("foot"), meaning "footless". 
The English name needletail is from the spined or thorny tail ends.