I personally had no idea this guy existed - also, I don't think it should be encouraged to create new tags for every historical figures, especially those who aren't extremely well known.
Of the 15 results that show up from searching Ulysses Grant, only five are questions. Of these, only three are actually about Grant - the other two are about the Battle of Tsushima and types of sieges.
I do not think a tag is required in this case, and it definitely should not be just the surname.
My understanding is that tags are meant to group questions at a higher level (as meta-data) than can easily found with the site search. In this case a search for "Ulysses S Grant" readily returns a list of questions that relate to him directly. Therefore there seems to be little benefit in adding a tag directly for him (or any other named individual).
If, however, you were to search for "U.S. Generals", the search engine has a harder time in picking questions that are directly related to that term. So a tag for "U.S. Generals" would potentially be useful.
First off, I've removed the tag from the answer for now.
I endorse (and upvoted, sempaiscuba's answer). I would like to address the tag itself though.
I'd think 14 is plenty for a tag if people really want one. However, I don't think it should be simply "grant". It isn't even obvious that's for a person (suppose someone starts using it for questions about land-grant schools?) So the questions should be 2 here:
- Do we really want this tag?
- If so, what should its exact name be?
For #1, Again I think 14 answers would be a supportable number.
Personally, I'm a little surprised that you had never heard of Ulysses S Grant. He was one of the major characters in the US Civil War, and President of the United States (he was president when Custer was defeated at the Battle of Little Bighorn).
On the broader question, I agree that we shouldn't create tags for every historical figure. As I understand it, the purpose of tags is to allow people to find related material. As such, there should probably be as few tags as possible.
I really don't know whether Grant should qualify or not. A quick search shows that Ulysses S. Grant is currently mentioned in 14 questions/answers.
I would certainly hope that anyone creating a new tag would then do a simple search to see whether there are other questions that should also be tagged with it. A tag that is applied to just one question is pointless.