1) Historical Celtic people 
The Gangani (Γαγγανοι) were a people of ancient Ireland who are referred to in Ptolemy`s 2nd century Geography as living in the south-west of the island, probably near the mouth of the River Shannon, between the Auteini to the north and the Uellabori to the south. There appears to have been a people of the same name in north-west Wales, a....