¹"The Sons of Mil." Mythical Ireland - Newgrange, Ancient Sites, Myths, Mysteries, Tours and Astronomy. Web. 09 Mar. 2011. <http://www.mythicalireland.com/mythology/tain/sonsofmil.html>.

Author's note: A translation from the original text appears here (Section VIII, "The Sons of Mil." 31, para. 386).
It is understood by historians, in all these cases, that the place name was extant, and the person or thing connected to it was invented by the etymologizer.