Tatyar
From Tolkien Gateway
The original name of the second Clan of the Elves, Noldor, before the Great March. The Clan-name, meaning 'Seconds' (q. cardinal (t)atya 'second') was derived from the name of the father of the Clan, Tata 'Two'. Tata was the second Elf-father tho awake at Cuiviénen.
The other original clans were Minyar 'Firsts', and Nelyar 'Thirds' according to the Elf-fathers Imin 'One' and Enel 'Three'.
Source: HoME XI, 380-381.
