I know that this is a shot in the dark but there is a small location/town/commune in France,perched over a small spring,ostensibly the headquarters of the River Loire and which has a small 10th century chapel dedicated to St.Eman. The town is just a few small houses surrounding the shrine/chapel that are period to the date of the chapel.The River Loire empties into the Atlantic in Brittany. Wouldn't a person from Eman be known as d'Eman ????