It was more than just a pattern. Roddenberry wanted all Vulcan male names to start with an "S." I don't remember if the female "T" names made his & Whitfield's book "The Making of Star Trek."Well, while it hardly said "This is the only way we do names" in TOS they did have a pattern where the females had a T and an apostrophe before the rest of the name while males' names started with S.