In Star Trek, originally, there was a rule about Vulcan names. Male Vulcan names were 5 letters (in English, not Vulcan) and started with an "S" and ended with a "K" (like Spock, Sarek, or Surak). Female Vulcan names started with "T'P", such as T'Pring and T'Pau. I read a few memos discussing this in Stephen E. Whitfield's The Making of Star Trek.
Obviously, this allows for a limited number of male names (but the number of female names is almost unlimited). As best I can find, all the Vulcan names from The Original Series follow these naming rules. But, also obviously, names like Tuvok do not.
I doubt there's any in-universe logic to this, but at some point Trek writers must have felt the need to drop the original concept of specific spelling (or phonetic) rules for Vulcan names.
Was this ever discussed in any interviews or brought up? When did this change happen and is there any information on who made this change?