Hello. I just thought i would make contact as i came across your query. I would be happy to exchange contacts with you. I was born in guernsey (now living across the water in England). The de Bertrand family is still on the island and Sophia would have been related to one of my ancestors. Sophie / Sophia seemed to be a family name in use for some generations after emmigration. I have a little family history information at home but there is more available at the Guernsey Priaulx library.