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Chestnut munia or black-headed munia (Lonchura atricapilla),
Formerly considered conspecific with the closely related tricoloured munia

The chestnut munia or black-headed munia (Lonchura atricapilla) is a small passerine of the family Estrildidae of estrildid finches.

Lonchura is a genus of the estrildid finch family (Estrildidae), and includes munias (or minias) and mannikins who are seed-eating.

1/ White-rumped munia (Lonchura striata) or white-rumped mannikin, sometimes called striated finch (Di cam, Lonchura striata)
2/ Scaly-breasted munia or spotted munia, known in the pet trade as nutmeg mannikin or spice finch (Di đá, Lonchura punctulata)
3/ Tricoloured munia (Di đầu đen, Lonchura malacca)
4/ White-bellied munia (Lonchura leucogastra) 

5/ Chestnut munia or black-headed munia (Lonchura atricapilla)
6/ White-headed munia (Lonchura maja)

The name mannikin is from Middle Dutch mannekijn 'little man'.
The family name Estrildidae (estrildid finches) is derived from Estrilda (Genus Name), a genus of the family. It is based on a "literary coinage" from Old Norse, ástareldr, which translates to "love-fire". This name likely refers to the vibrant red coloration found in many species (like the common waxbill).
Lonchura the Ancient Greek lonkhē meaning "spear-head" or "lance" with oura meaning "tail".

Scaly-breasted munia 
or spotted munia, known in the pet trade as nutmeg mannikin or spice finch 
(Di đá, Lonchura punctulata)

The scaly-breasted munia or spotted munia (Lonchura punctulata), known in the pet trade as nutmeg mannikin or spice finch, is a sparrow-sized estrildid finch native to tropical Asia. 
The bird occurs from India and Sri Lanka east to Indonesia and the Philippines

The name mannikin is from Middle Dutch mannekijn 'little man'.
Lonchura the Ancient Greek lonkhē meaning "spear-head" or "lance" with oura meaning "tail".
punctulata: Latin punctulatus spotted, dotted.

Tricoloured munia 
(Di đầu đen, Lonchura malacca)

The tricoloured munia (Lonchura malacca) is an estrildid finch, native to Bangladesh, India, Sri Lanka, Pakistan, and southern China.

The name mannikin is from Middle Dutch mannekijn 'little man'.
Lonchura the Ancient Greek lonkhē meaning "spear-head" or "lance" with oura meaning "tail".

White-bellied munia (Lonchura leucogastra) 

The white-bellied munia (Lonchura leucogastra) is a species of estrildid finch.

White-headed munia (Lonchura maja)

The white-headed munia (Lonchura maja) is a small passerine bird belonging to the estrildid finch family Estrildidae.
This bird species is native to Southeast Asia, including countries like Indonesia, Thailand, Malaysia, Vietnam and Singapore.

White-rumped munia  
or white-rumped mannikin, sometimes called striated finch 
(Di cam, Lonchura striata)

The white-rumped munia (Lonchura striata) or white-rumped mannikin, sometimes called striated finch in aviculture, is a small passerine bird from the family of waxbill "finches" (Estrildidae). 

The bird is native to tropical continental Asia and some adjacent islands.