Ciconia is a genus of birds in the stork family Ciconiidae. The genus name is the Latin word for "stork".
English common names for this species include the white-necked stork, white-headed stork, bishop stork and parson-bird. 

1/ Asian woolly-necked stork or Asian woollyneck (Hạc cổ trắng, Ciconia episcopus)
The specific epithet episcopus is Latin for "bishop".
Recently, the African and Asian populations are considered to be two different species: the African woolly-necked stork and the Asian woolly-necked stork. This is based purely on geographical isolation,yet there is no morphological or phylogenetic evidence yet to support this split.

2/ Black stork (Hạc đen, Ciconia nigra)
Ciconia nigra is from the Latin words for "stork" and "black" respectively.

3/ White stork (Hạc trắng, Ciconia ciconia)