A C++ best practice is to NOT write raw loops.

Nevertheless, here is a version how you can achive it with the help of an index.

#include <iostream>
#include <vector>

int main() {
    std::vector<std::string> names{"Jeff",  "Jim", "Jerry", "Lisa",
                                   "Terry", "Tim", "Tiff"};

    std::cout << "This is the vector printing forwards\n";
    for (int i = 0; i < names.size(); i++) {
        std::cout << names[i] << std::endl;
    }

    std::cout << "This is the vector printing backwards\n";
    for (int i = names.size() - 1; i >= 0; i--) {
        std::cout << names[i] << std::endl;
    }
}

All containers offer a reversed view of their content with rbegin() and rend(). These two functions return so-calles reverse iterators, which can be used like normal ones, but it will look like the container is actually reversed.

#include <vector>
#include <iostream>

template<class InIt>
void print_range(InIt first, InIt last, char const* delim = "\n"){
  --last;
  for(; first != last; ++first){
    std::cout << *first << delim;
  }
  std::cout << *first;
}

int main(){
  int a[] = { 1, 2, 3, 4, 5 };
  std::vector<int> v(a, a+5);
  print_range(v.begin(), v.end(), "->");
  std::cout << "\n=============\n";
  print_range(v.rbegin(), v.rend(), "<-");
}

Live example on Ideone. Output:

1->2->3->4->5
=============
5<-4<-3<-2<-1