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Himantopus is a bird genus commonly known as stilt in the family Recurvirostridae.
The generic name Himantopus comes from the Ancient Greek meaning "strap-leg".

1/ Black-winged stilt (Cà kheo, Himantopus himantopus)

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'.

The Recurvirostridae are a family of birds in the wader suborder Charadrii in the bird order Charadriiformes. 
It contains two distinct groups of birds, the avocets (one genus) and the stilts (two genera).