 A number of French / Norman placenames remain , from the period when the island was in the jurisdiction of the Duchy of Normandy . The Herm Island map , published by the tenant of Herm , states that main place names , including the island name itself , have unclear origins , although there is an unofficial Anglicisation of names ; for example , La Pointe du gentilhomme was changed to " Alderney Point " . The primary present language on Herm is English . 
