Nemain

In Irish mythology, Neman or Nemain (modern spelling: Neamhan, Neamhain) is the spirit-woman or goddess who personifies the frenzied havoc of war. 
The variant forms in which her name appears in Irish texts are Nemon ~ Nemain ~ Neman. These alternations imply that the Proto-Celtic form of this theonym, if such a theonym existed at that stage, would have been *Nemānjā, *Nemani-s or *Nemoni-s. 
The meaning of the name has been various glossed. Squire (2000:45) glossed the name as 'venomous' presumably relating it to the Proto-Celtic *nemi- 'dose of poison' 'something which is dealt out' from the Proto-Indo-European root *nem- 'deal out' (Old Irish nem, pl. neimi 'poison' ). However, *nemi- is clearly an i-stem noun whereas the stems of the reconstructed forms *Nemā-njā, *Nema-ni-s and *Nemo-ni-s are clearly a-stem and o-stem nouns respectively. 
Equally, the Proto-Celtic *nāmant- 'enemy' (Irish námhaid, genitive namhad 'enemy' from the Old Irish náma, g. námat, pl.n. námait [1]) is too different in form from *Nemānjā, *Nemani-s or *Nemoni-s to be equated with any of them. 
The name may plausibly be an extended form of the Proto-Indo-European root of the name is *nem- 'seize, take, deal out' to which is related the Ancient Greek Némesis 'wrath, nemesis' and the name Nemesis, the personification of retributive justice in Greek mythology. This is related to the Ancient Greek Nomos, which means a custom or law, and also means to divide, distribute, or to allot. The Proto-Indo-European root is the Old High German nâma 'rapine,' German nehmen, 'take,' English nimble; Zend nemanh 'crime,' Albanian name 'a curse' and the Welsh, Cornish, and Breton nam, 'blame' [2]. According to this theory, the name would mean something like 'the Great Taker' or the 'Great Allotter.' 
Aos sí (pronounced [iːsˠ ˈʃiː]; older form: aes sídhe [eːsˠ ˈʃiːə]) is the Irish name for a supernatural race in Celtic mythology – spelled sìth by the Scots, but pronounced the same – comparable to fairies or elves. They are said to descend from either fallen angels or the Tuatha Dé Danann, meaning the "Tribe of Danu", depending on the Abrahamic or pagan tradition. 
The aos sí are said to live underground in fairy forts, across the western sea, or in an invisible world that coexists with the world of humans. 
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