Gann or Gand ("scanty, mean, grudging") is the name of two early settlers of Ireland in Irish mythology.
1. Gann was the name of a king of the Fomorians who was defeated, along with his brother Sengann (1), by Nemed.
2. Gann son of Dela of the Fir Bolg was joint High King of Ireland with his brother Genann after the death of their brother Rudraige (2). They ruled for four years before they both died of plague, and were succeeded by their brother Sengann (2).
See also
Lebor Gabála Érenn