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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.