Recurvirostra is a genus of wader birds in the avian family Recurvirostridae as the stilts.
The common name avocet is thought to derive from the Italian word avosetta, which may relate to Latin avis ("bird"). 

1/ Pied avocet (Cà kheo mỏ cong, Recurvirostra avosetta)

Charadrius, Charadriidae or Charadriiformes comes from the Ancient Greek kharadrios, meaning a bird found in river valleys or ravines ((kharadra) being ravine), and was later adopted into Late Latin. 

The name Recurvirostridae is derived from Latin, combining recurvus (bent back/curved) and rostrum (bill), referring to avocets' upturned bills.

The genus name comes from Latin recurvus, 'curved backwards' and rostrum, 'bill'.