Noun
Fenni pl (plural only)
(historical) An ancient people of northeastern Europe first described by Cornelius Tacitus in Germania in AD 98. It is unclear whether the Fenni are connected with the present-day Finns.
In Welsh, the shortened form Y Fenni may have come into use for a very short period after about the 15th century, although pronounced similarly in English or Welsh the English spelling Abergavenny is in general use. Source: Internet