Friis family in Drammen

I am looking for information on Christopher Thoger Olausen Friis, born 29 sep 1835 in Drammen. His father was Thoger Olausen Friis and his mother Christiane Meier. Christopher later married a Catherine Mullen in India. He left Norway for Ireland then India. They had a number of children, all with the surname of Browne as Christopher changed his name to Charles William Browne. I would like to find out why he changed his identity so radically. He died in 1900 aboard a French Steamer. He is a total mystery and I would welcome any information relating to his life and his family. Many thanks