Spock/Appendices/Background information/Name

Jane Wyatt, who played Spock's mother Amanda Grayson, was once asked by fans at a convention what Spock's first name was. She replied, perhaps jokingly, "Harold" Jane Wyatt - Guardian Obituaries However, the question itself was flawed, since the episode makes it clear that "Spock" is Spock's personal name.
On the other hand, Spock's family name has never been established in canon. In the episode , Leila Kalomi says to Spock, "You never told me if you had another name," to which he replies, "You couldn't pronounce it." D.C. Fontana – who was considered the "Vulcan expert" of the TOS behind-the-scenes staff and who created such details as the fact that Spock's father was an ambassador and his mother a school teacher – revealed, in an issue of the fanzine Spockanalia, that she had intended his family name to be "Xtmprsqzntwlfd", but since this is unpronounceable, there wasn't really any way to get this said in dialogue during an episode.
The Pocket TOS book gives Spock's full name as "S'chn T'gai Spock". This name was also used on a poster for Star Trek: Strange New Worlds at the Mission Chicago Trek Convention, but CBS said that it was "incorrect" the next day and had the posters replaced.Dr. Mbenga and Spock's first names
Since the release of the film , the original reality version of Spock is now often referred to on websites and other media as "Spock Prime", to differentiate from the alternate reality version of the character.