This improv game is in the following improv game categories:
One person is 'it'. Pair up others so one they are side by side touching one foot to the other on that side. The pairs swap names and the person who is 'it' (standing in one spot - they can't move) calls out a name. The newly named person must run over to them without getting tagged by the real named person. If tagged they return to the pair. If they get away they join the 'it' person (and swap names) and the partnerless person is now the new 'it' person and calls out names.
When a name is called and the wrong person runs they have have to return to where they were standing in the pair AND IF the person who was supposed to run is still within tagging distance OR if they walk to close to tagging distance they can be tagged then. The tagger can not chase the person but often in the confusion the runner stays within tagging distance for a while.
Make sure pairs are away from walls and furniture because often the runner leaps away to avoid getting tagged and you want to avoid crashing into anything or anyone.