Possibly means "the ancestor is a young man" in Sumerian. This was the name of a Sumerian hero, later appearing in the Akkadian poem the 'Epic of Gilgamesh'. Gigamesh, with his friend Enkidu, battled the giant Humbaba and stopped the rampage of the Bull of Heaven, besides other adventures. Gilgamesh was probably based on a real person: a king of Erech who ruled around the 27th century BC.
There were no related names found for Gilgamesh.