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

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

The genus name Asio is from asiō, the Latin name used by Pliny the Younger for a type of horned owl, the feather tufts on the head of these owls give the appearance of "ears" which is a defining characteristic.

Long-eared owl (Asio otus), 
also known as the northern long-eared owl or, more informally, as the lesser horned owl or cat owl

The long-eared owl (Asio otus) is a medium-sized species of owl of the family Strigidae.
The bird has an extensive breeding range: Eurasia and Africa. 

The name Strigiformes is formed from "Strig", the plural form of the Latin word "strix", meaning "owl", and "formes", meaning "forms".

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

The genus name Asio is from asiō, the Latin name used by Pliny the Younger for a type of horned owl, the feather tufts on the head of these owls give the appearance of "ears" which is a defining characteristic. The possible origin is from ancient Greek οὖς (pronounced roughly as oos) is a noun meaning "ear".

The specific epithet, otus, is derived from Greek and refers to a small eared owl.

Otus (Latin) and Ōtos/Ὦτος (Ancient Greek) primarily refer to two distinct things: a giant in Greek mythology and a genus of small-eared owls. It stems from the Greek ous (ear), implying a "horned" or "eared" owl, or relates to the mythological giant known for being "insatiate".

Short-eared owl 
(Cú lửa, Asio flammeus)

The short-eared owl (Asio flammeus) is a widespread grassland species in the family Strigidae.
The bird is found on all continents except Antarctica and Australia, and it is partially migratory.

The name Strigiformes is formed from "Strig", the plural form of the Latin word "strix", meaning "owl", and "formes", meaning "forms".

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

The genus name Asio is from asiō, the Latin name used by Pliny the Younger for a type of horned owl, the feather tufts on the head of these owls give the appearance of "ears" which is a defining characteristic. The possible origin is from ancient Greek οὖς (pronounced roughly as oos) is a noun meaning "ear".

Flammeus is a Latin adjective meaning "flaming," "fiery," or "fiery red," derived from the Latin word flamma (flame).