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".