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Aceros is a genus of Asian hornbills (family Bucerotidae).

Bucerotiformes, Bucerotidae, Buceros: Latin bucerus horned like an ox (Greek boukeros: horned like an ox: bous ox; keros: horn).
Aceros: Greek akeros: hornless.

1/  Rufous-necked hornbill (Niệc cổ hung, Aceros nipalensis) 

Anthracoceros is a genus of birds in the family Bucerotidae.
The name is a combination of the Ancient Greek words:
 ανθραξ anthrax, ανθρακος anthrakos meaning "coal black" ,
and κερας keras, κερως kerōs meaning "horn".

1/ Malabar pied hornbill (Cao cát bụng trắng, Anthracoceros coronatus), also known as lesser pied hornbill
Anthracoceros coronatus [malabaricus or albirostris] (= Anthracoceros coronatus malabaricus)

2/ Black hornbill (Cao cát đen, Anthracoceros malayanus)

3/ Oriental pied hornbill (Cao cát phương đông, Anthracoceros albirostris) 
albirostris
From albus (“white”) +‎ rōstrum (“beak”)

Buceros is a genus of large Asian hornbills (family Bucerotidae).

The order name     Bucerotiformes, family name  Bucerotidae are from Latin becerus meaning "horned like an ox" which in turn is from the Ancient Greek boukerōs which combines bous meaning "ox" with kerōs meaning "horn".
Buceros: Ancient Greek boukerōs which combines bous meaning "ox" with kerōs meaning "horn".

1/ Great hornbill (Buceros bicornis), also known as the concave-casqued hornbill, great Indian hornbill or great pied hornbill
The specific bicornis is Latin and means "two-horned".

Hornbills (Bucerotidae) are a family of bird found in tropical and subtropical Africa, Asia and Melanesia. 
The order name is from Latin becerus meaning "horned like an ox" which in turn is from the Ancient Greek boukerōs which combines bous meaning "ox" with kerōs meaning "horn".

Anorrhinus is a genus of hornbills (family Bucerotidae) found in forests of Southeast Asia (just barely extending into adjacent parts of India and China). 

1/  Tickell's brown hornbill (Anorrhinus tickelli), also known as the rusty-cheeked hornbill
2/ Austen's brown hornbill (Niệc nâu, Anorrhinus austeni) 
Austen's brown hornbill is sometimes considered as a subspecies of Tickell's brown hornbill.

Berenicornis is a genus of hornbills (family Bucerotidae).

1/  White-crowned hornbill (Niệc đầu trắng, Berenicornis comatus), alsothe long-crested hornbill or white-crested hornbill (leading to easy confusion with the African white-crested hornbill), is a species of hornbill.

The white-crowned hornbill is sometimes placed in genus Aceros instead

Rhyticeros is a genus of medium to large hornbills (family Bucerotidae) found in forests from Southeast Asia to the Solomons.

The order name is from Latin becerus meaning "horned like an ox" which in turn is from the Ancient Greek boukerōs which combines bous meaning "ox" with kerōs meaning "horn".
Rhyticeros Greek rhutis, rhutidos wrinkle; keros horn.

1/  Wreathed hornbill (Niệc mỏ vằn, Rhyticeros undulatus)