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The name Anastomus is from the Ancient Greek anastomoō meaning "to furnish with a mouth" or "with mouth wide-opened".
The mandibles of these birds do not meet except at the tip, or there is a gap between the arched upper mandible and recurved lower mandible.

1/ Asian openbill or Asian openbill stork (Cò nhạn, Cò ốc, Anastomus oscitans)
The specific epithet oscitans is the Latin word for "yawning".

Ciconiiformes, Ciconiidae: from Latin ciconia for stork.

Asian openbill 
or Asian openbill stork 
(Cò nhạn, Cò ốc, Anastomus oscitans)

The Asian openbill or Asian openbill stork (Anastomus oscitans) is a large wading bird in the stork family Ciconiidae.

Ciconiiformes, Ciconiidae: from Latin ciconia for stork.
Anastomus: from the Ancient Greek anastomoō meaning "to furnish with a mouth" or "with mouth wide-opened".
The specific epithet oscitans is the Latin word for "yawning", oscitare to yawn, Bec-ouvert.

Bec-ouvert indien
Asian openbill, or Asian openbill stork 
(Cò nhạn, Cò ốc, Anastomus oscitans)

Le Bec-ouvert indien (Anastomus oscitans) ou anastome est une espèce d'oiseau aquatique appartenant à la famille des Ciconiidae, Ciconiidés.

Ciconiiformes, Ciconiidae, Ciconiidés: mot latin ciconia pour cigogne.
Anastomus: vient du grec ancien anastomoō signifiant Bec-ouvert.
oscitans: mot latin pour "bâiller", oscitare, Bec-ouvert.