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Pygmy owls are members of the genus Glaucidium. They belong to the typical owl family (true owl), Strigidae. 

Glaucidium Greek: glaukidion little owl, owlet.

1/ Asian barred owlet (Cú vọ, Glaucidium cuculoides) also known as the Cuckoo owlet

Ketupa is a genus of owls in the family Strigidae. The genus now contains twelve species (formerly only 3 species), nine of which were formerly placed in the genus Bubo.

Strigidae: derived from "Strix", a Latin word for owl (also the same in Greek).
Ketupa: From specific name Strix ketupu.

1/ Tawny fish owl (Dù dì hung, Ketupa flavipes)
2/ Buffy fish owl (Dù di kêtupu, Ketupa ketupu), also known as the Malay fish owl
3/ Spot-bellied eagle-owl (Dù dì Nêpan, Ketupa nipalensis), also known as the forest eagle-owl
4/ Brown fish owl (Dù dì phương đông, Ketupa zeylonensis) 

Ninox is a genus of true owls or typical owls comprising 36 species found in Asia and Australasia. Many species are known as hawk-owls or boobooks, but the northern hawk-owl (Surnia ulula) is not a member of this genus.

Strigiformes: All Owls are classified as members of this order. The name is formed from "Strig", the plural form of the Latin word "strix", meaning "owl" and "formes", meaning "forms".
Strigidae: The family for all Owls except Barn Owls, derived from "Strix", a Latin word for owl (also the same in Greek).
Ninox: 
- In Greek mythology, the Latin word, Nisus, is the king of Megara who turned into a hawk. 
- The Latin word, noctua, refers to owl. 
- Ninox: derived by Hodgson in 1837 to describe the hawk-like appearance of Ninox nipalensis; junior synonym for Ninox scutulata lugubris.

1/ Brown boobook (Cú vọ lưng nâu, Ninox scutulata), also known as the brown hawk-owl

Scops owls are typical owls in family Strigidae belonging to the genus Otus and are restricted to the Old World.

Otus is from Greek meaning a eared owl.

1/ Sunda scops owl (Cú Mã Lai, Otus lempiji)
2/ Mountain scops owl (Cú mèo Latusơ, Otus spilocephalus), sometimes referred to as the spotted scops owl

(spílos) f (genitive σπίλου); rock, reef, cliff
Cephalus (/ˈsɛfələs/; Ancient Greek: Κέφαλος Kephalos means "head" is a name used both for the hero-figure in Greek mythology and carried as a theophoric name by historical persons.

3/ Oriental scops owl (Cú mèo nhỏ, Otus sunia)

The true owls or typical owls (family Strigidae) are one of the two generally accepted families of owls, the other being the barn owls (Tytonidae).

Strigiformes: All Owls are classified as members of this order. 
The name is formed from "Strig", the plural form of the Latin word "strix", meaning "owl", and "formes", meaning "forms".

Strigidae: The family for all Owls except Barn Owls, derived from "Strix", a Latin word for owl (also the same in Greek)

Tytonidae: All barn owls are members of this family. The name is derived from the Greek word "tuto", which means "owl".

Strix is a genus of owls in the typical owl family (Strigidae). Common names are earless owls or wood owls, though they are not the only owls without ear tufts, and "wood owl" is also used for forest-dwelling owls. Neotropical birds in the genus Ciccaba are sometimes included in Strix.

Strigidae: The family for all Owls except Barn Owls, derived from "Strix", a Latin word for owl (also the same in Greek).

1/ Brown wood owl (Hù, Strix leptogrammica)
2/ Tawny owl (Hù nivicon, Cú vàng nâu, Strix aluco), also called the brown owl
3/ Spotted wood owl  (Hù phương đông, Strix seloputo)

Taenioptynx is a genus of typical owls, or true owls, in the family Strigidae, that inhabits Asia.
The genus name combines the Ancient Greek tainia meaning "band" or "stripe" with ptunx meaning "owl".

1/ Collared owlet (Cú vọ má trắng, Cú vọ mặt trắng, Taenioptynx brodiei), also known as the collared pygmy owl
formerly Glaucidium brodiei

Asio is a genus of typical owls, or true owls, in the family Strigidae. 

1/ Short-eared owl (Cú lửa, Asio flammeus)

Athene is a genus of owls, containing nine living species, depending on classification. 

1/ Spotted owlet (Hù trán trắng, Athene brama)