The darters, anhingas, or snakebirds are mainly tropical waterbirds in the family Anhingidae, which contains a single genus, Anhinga. 

Suliformes maybe from Old Norse Sula +‎ -iformes for boobies, gannets.
Anhinga is derived from the Tupi ajíŋa (also transcribed áyinga or ayingá), which in local mythology refers to a malevolent demonic forest spirit; it is often translated as "devil bird". The name changed to anhingá or anhangá as it was transferred to the Tupi–Portuguese Língua Geral.

1/ Oriental darter (Cổ rắn, Điêng điểng, Anhinga melanogaster)