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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. 

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.