Rufous-bellied swallow (Nhạn bụng hung, Cecropis badia)

The rufous-bellied swallow (Cecropis badia) is a species of swallow that breeds on the Malay Peninsula. 

Hirundinidae: Latin hirundo swallow.
The name of the genus is from the Ancient Greek Kekropis "Athenian woman".
badia: from a related Latin word, badius, meaning "bay" or "reddish-brown".