The "Xenaverse" is the official nickname for the universe in which the events of Xena: Warrior Princess take place. The name was given in the official companion to the series, Xena: Warrior Princess: The Official Guide to the Xenaverse.
Hercules?
Due to the Xena-centric name, many fans don't include events from Hercules: The Legendary Journeys or Young Hercules as Xenaverse-set stories. Because Xena spun-off of the Hercules franchise, most fans consider them all to take place in the same continuity. The Dictionary of Fiction attempted to sidestep this issue by referring to their world as the "Herc-Xenaverse."