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".