Having the target in the thread name definitely seems like a good idea and would help ease debugging, not just for our tests but when printing thread objects in general. 

I would agree with the suggestion of placing the counter in there for when multiple threads get spawned with the same target or maybe even using names like:

  Thread-1 (doit)
  Thread-2
  Thread-3 (print)

might be better just for people who are familiar with them.