Rather than there not ever being a [tag:jon-skeet] tag, it seems from the [comment by @Glorfindel][1] that: 

> it has been created quite often and then it gets deleted by regulars
> (read: the regulars remove it from all questions and then it gets
> deleted by the system as an unused tag).

This indicates that the reason there is not a [tag:jon-skeet] tag is that the community sees no case for its existence and burninates it whenever it is re-created.

Rather than creating it or repeated burnination it seems to me like [blacklisting][2] it may be more appropriate.


  [1]: https://meta.stackexchange.com/questions/304040/why-isnt-there-a-jon-skeet-tag/304043#comment988388_304040
  [2]: https://meta.stackexchange.com/a/239192/215590