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Pond herons (Ardeola) are herons. The scientific name comes from Latin ardeola, a small heron (ardea).

1/ Chinese pond heron (Cò bợ, Ardeola bacchus) 
2/ Javan pond heron (Cò bợ Java, Ardeola speciosa) 

Butorides is a genus of small herons in the family Ardeidae. Butorides is from Middle English Butor "bittern" and Ancient Greek -oides, "resembling".
It contains three similar species which were formerly considered one species:
-the green heron or green-backed heron, Butorides virescens;
- the lava heron (Butorides sundevalli);
- and the striated heron, Butorides striatus.

1/ Striated heron (Cò xanh, Butorides striata) also known as mangrove heron, little green heron or green-backed heron

Egretta is a genus of medium-sized herons, mostly breeding in warmer climates.
The genus name comes from the Provençal French for the little egret, aigrette, a diminutive of aigron, "heron".

1/ Pacific reef heron (Cò đen, Egretta sacra), also known as the eastern reef heron or eastern reef egret
2/ Little egret (Cò trắng, Egretta garzetta) 
The species epithet garzetta is from the Italian name for this bird, garzetta or sgarzetta.
3/ Chinese egret or Swinhoe's egret (Cò trắng Trung Quốc, Egretta eulophotes)

Striated heron (Cò xanh, Butorides striata) also known as mangrove heron, little green heron or green-backed heron

The striated heron (Butorides striata) also known as mangrove heron or little green heron, is a small heron in the heron family Ardeidae.

Ardeidae, Ardea: the Latin word ardea meaning "heron".
Butorides is a genus of small herons in the family Ardeidae. Butorides is from Middle English Butor "bittern" and Ancient Greek -oides, "resembling".
"Striata" is a Latin word striatus meaning "striped," "grooved," or "lined". It originates from the Latin word \(stria\), which means "furrow" or "channel". The term is frequently used in scientific names, particularly in biology and botany, to describe the appearance of something with lines or stripes.