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Anas is a genus of dabbling ducks. It includes the pintails, most teals, and the mallard and its close relatives. The name Anas is the Latin for "duck".

1/ The Eurasian teal (Mòng két, Anas crecca), common teal, or Eurasian green-winged teal
The bird gives its name to the blue-green colour teal.
2/ Mallard or wild duck (Vịt cổ xanh, Anas platyrhynchos) 

3/ Pintail or northern pintail (Vịt mốc, Anas acuta) 
The epithet acuta comes from the verb acuere meaning "to sharpen" which refers to the pointed tail of the male in breeding plumage.

4/ Indian spot-billed duck (Vịt trời, Vịt mỏ đốm, Anas poecilorhyncha) 
The English name is derived from the red spot at the base of the bill that is found in the mainland Indian population.
The specific epithet poecilorhyncha combines the classical Greek words poikilos meaning "pied" or "spotted" and rhunkhos meaning a "bill".

The Anatidae are the biological family of water birds that includes ducks, geese, and swans in the order Anseriformes. 

anser: Latin anser goose;
anas, anatis: Latin duck.

Les Anatidae (ou Anatidés) constituent la plus importante famille de l'ordre des Anseriformes. 

anser: mot latin anser oie;
anas, anatis: mot latin pour canard.

Anseriformes is an order of birds also known as waterfowl that comprises about 180 living species of birds in three families: Anhimidae (three species of screamers), Anseranatidae (the magpie goose), and Anatidae.

anser: Latin anser goose;
anas, anatis: Latin duck.

ALes Anseriformes (en français ansériformes) sont un ordre d'oiseaux comprenant trois familles regroupant 169 espèces et 51 genres de canards, oies, kamichis, canaroies et cygnes (selon le Congrès ornithologique international). 

anser: mot latin anser oie;
anas, anatis: mot latin pour canard.

Aythya is a genus of diving ducks. The name Aythya comes from the Ancient Greek word authuia, which may have referred to a sea-dwelling duck or an auklet.

1/ Greater scaup (Vịt biển, Aythya marila), scaup in Europe, or "bluebill" in North America
The epithet marila is from the Greek word for charcoal embers or coal dust.
2/ Baer's pochard (Vịt đầu đen, Aythya baeri) 
3/ Common pochard (Vịt đầu đỏ, Aythya ferina), known simply as pochard

4/ Tufted duck or tufted pochard (Vịt mào, Aythya fuligula)
The epithet is from Latin fuligo 'soot' and gula 'throat'.

5/ Ferruginous duck (Vịt mặt trắng, Aythya nyroca), also known as ferruginous pochard, common white-eye or white-eyed pochard
The epithet is from nyrok, the Russian name for a duck.

Some taxonomists list the genus Dendrocygna (whistling ducks or tree ducks) as the only one species of the subfamily Dendrocygninae of the duck, goose and swan in the family Anatidae. Some other taxonomists list the white-backed duck (Thalassornis leuconotus) under this subfamily. The subfamily Dendrocygninae is also considered a separate family Dendrocygnidae by some authorities.

anser: Latin anser goose;
anas, anatis: Latin duck.
Dendrocygna: Greek dendron tree; genus Cygnus;
cygnus: Latin swan;
Greek kuknos swan;

1/ Lesser whistling duck (Le nâu or Le le, Dendrocygna javanica), also known as Indian whistling duck or lesser whistling teal

Mareca is a genus or subgenus of ducks in the family Anatidae that includes the wigeons.
The name of the genus is from the Portuguese word Marreco for a small duck.[
The species were formerly placed in the genus Anas.

1/ Gadwall (Vịt cánh trắng, Mareca strepera)
2/ Eurasian wigeon or European wigeon (Vịt đầu vàng, Mareca penelope), also known as the widgeon or the wigeon
The epithet name derives from Ancient Greek pene, "braid" and ops "appearance"

3/ Falcated duck or falcated teal (Vịt lưỡi liềm, Mareca falcata)

Mergus is the genus of the typical mergansers fish-eating ducks in the subfamily Anatinae. The genus name is a Latin word to refer to an unspecified waterbird.

1/ Scaly-sided merganser or Chinese merganser (Vịt mỏ nhọn, Mergus squamatus)

The pygmy geese are a group of very small "perching ducks" in the genus Nettapus which breed in the Old World tropics. The genus Nettapus name is from Ancient Greek nētta meaning "duck" and pous meaning "foot".

1/ Cotton pygmy goose or cotton teal (Le khoang cổ, Nettapus coromandelianus)

Sarkidiornis is a genus of ducks in the family Anatidae.
Most taxonomic authorities classify the knob-billed duck and the comb duck separately.

1/ Knob-billed duck (Vịt mồng, Sarkidiornis melanotos), or African comb duck

Sibirionetta is a genus of ducks in the family Anatidae. The species of this genus were formerly placed in the genus Anas.
The name Sibirionetta is derived from the Latin sibiricus for Siberia and the Ancient Greek netta for a duck. 

1/ Baikal teal (Vịt Bai Can, Sibirionetta formosa), also called the bimaculate duck or squawk duck
The specific epithet formosa is from the Latin formosus for "beautiful".

Spatula is a genus or subgenus of ducks in the family Anatidae that includes the shovelers, garganey, and several species of American teals.
The species of this genus were formerly placed in the genus Anas. The name Spatula is the Latin word for "spoon", from which the English word "spatula" also originates.

1/ Garganey (Mồng két mày trắng, Spatula querquedula)
The specific epithet is derived from Latin querquedula, a word believed to represent to its call.
2/ Northern shoveler (Vịt mỏ thìa, Spatula clypeata), known simply in Britain as the shoveler