Nel also known as Nuil or Niul was a mythical figure from the Lebor Gabála Érenn and was an ancestor of the people of Ireland. He was the son of Fénius Farsaid,genealogical chart Mary Jones' Celtic Encyclopedia who was a legendary king of Scythia, who left Babylon after the destruction of Babel. Nel returned to Babylon as part of an effort to study the confusion of languages. He was a scholar of languages and was invited by Pharaoh Cingris to Egypt to take his daughter Scota’s hand in marriage.Lebor Gabála Érenn Irish Text Society (1870-1950) p. 39 Also Nel was the father of Goídel Glas who was credited with creating the Goidelic languages., Vol. 2, p. 13 (¶107), Vol. 1 p. 149 "It is Gaedel Glas who fashioned the Gaelic language out of the seventy-two..."; Macalister
References
Sources Irish pedigrees; or, The origin and stem of the Irish nation (1892), by John O'Hart, - Volume: 1 Irish pedigrees; or, The origin and stem of the Irish nation (1892), by John O'Hart, - Volume: 2 Lebor gabala Erenn Volume 1, Irish Text society 1870-1956
A brief overview and large genealogical chart of Mythological Cycle narratives in the LGE are hosted at Mary Jones' Celtic Encyclopedia