About Spock's full name, the last page of Barbera Hambly's novel Ishmael
gives it as S'chn T'gai Spock. Sarek is S'chn T'gai Sarek of the Hgrtcha Clan.
The old Treknical fanzine USS Enterprise Officer's Manual
by Geoffrey Mandel gave his full name as Xtmprszntwlfd Spock. I imagine he just mashed the keyboard.