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Butastur is a genus of birds of prey in the family Accipitridae.

1/ Grey-faced buzzard (Diều Ấn độ, Butastur indicus)
2/ Rufous-winged buzzard (Diều xám, Butastur liventer)

Accipitridae from Latin accipiter/accipitri- "hawk".
accipitrinus Latin accipitrinus hawk-like (accipiter: hawk).
The genus name Butastur is a combination of the Latin words buteo (meaning "buzzard") and astur (meaning "a hawk"), referring to a genus of birds that share characteristics of both. The name was created by combining the existing genera Buteo and Astur to describe a type of hawk or buzzard.

Buteo is a genus of medium to fairly large, wide-ranging raptors with a robust body and broad wings. Buteo is the Latin name of the common buzzard.

1/ Common buzzard (Diều Nhật Bản, Buteo buteo)

Buteo (Latin): Refers to a buzzard, a type of bird of prey. 

Common buzzard (Diều Nhật Bản, Buteo buteo)

The common buzzard (Buteo buteo) is a medium-to-large bird of prey in the family Accipitridae.

The species lives in most of Europe and extends its breeding range across much of the Palearctic as far as northwestern China, far western Siberia and northwestern Mongolia.
The bird is a year-round resident, except for those living in the colder parts of the Northern Hemisphere. 

Buteo (Latin): Refers to a buzzard, a type of bird of prey. 

Gray-faced Buzzard
(Diều Ấn độ, Butastur indicus)

The grey-faced buzzard (Butastur indicus) is an Asian bird of prey of the family Accipitridae.
The bird breeds in Manchuria, Korea and Japan; winters in South-east Asia.

Accipitridae from Latin accipiter/accipitri- "hawk".
accipitrinus Latin accipitrinus hawk-like (accipiter: hawk).
The genus name Butastur is a combination of the Latin words buteo (meaning "buzzard") and astur (meaning "a hawk"), referring to a genus of birds that share characteristics of both. The name was created by combining the existing genera Buteo and Astur to describe a type of hawk or buzzard.
indicus is Latin for Indian.

Pernis is a genus of birds in the family Accipitridae, subfamily Perninae whose members are commonly known as honey buzzards. 

Accipitridae from Latin accipiter/accipitri- "hawk".
The genus name is derived from Ancient Greek pernes, a term used by Aristotle for a bird of prey.

1/ Crested honey buzzard (Diều ăn ong, Pernis ptilorhynchus), also known as the Oriental, Asiatic, or Eastern honey buzzard. 

Rufous-winged buzzard (Diều xám, Butastur liventer)

The rufous-winged buzzard (Butastur liventer) is an Asian bird of prey. 
This bird species is a resident breeder of Indochina, Java and Sulawesi. 

Accipitridae from Latin accipiter/accipitri- "hawk".
accipitrinus Latin accipitrinus hawk-like (accipiter: hawk).
The genus name Butastur is a combination of the Latin words buteo (meaning "buzzard") and astur (meaning "a hawk"), referring to a genus of birds that share characteristics of both. The name was created by combining the existing genera Buteo and Astur to describe a type of hawk or buzzard.
liventer: In Latin, livere means "to be bluish" or to "be envious"; venter means "belly," "womb," or "bulge".  Latin liventer bluish, lead-coloured vent.