Renaming an existing sport doesn't seem to work - as the basic type does not change.
The watch has very exotic sports, even "archery", "meditation" or "breathing" (where use of a GPS-watch is questionable),
but there is no Orienteering, which is very much an endurance sport with the element of optimizing route selection and doing comparisons of the GPS tracks between orienteers after the race.
Renaming some activity type in "running" category just messes things up in statistics (VO2, run cadence etc) on Garmin Connect - it's a completely different effort to run in the deep forest.
