Meaning unknown. According to Virgil
's 'Aeneid', this was the name of the son of the Trojan Hyrtacus (himself mentioned in the 'Iliad', though Nisus is not). In the 'Aeneid' Nisus is the friend of Euryalus
. After Euryalus is captured by the Rutuli, both are slain when Nisus attempts to save him.