Sophar is a public figure, written up in Pocock's biography of Captain Marryat and researched by the Kensington Palace Archivist, among others. As he was brought back to England by Captain Marryat as a child, his actual parentage is unknown. However there are quite a number of family trees running around on the internet containing wild speculations about his exact relationship to the Burmese Royal Family. (This is one of the oral histories handed down through his family and one interpretation of his parentage, shown as "son of a Chief of the Kingdom of Ava" on his marriage certificate.)
Please PPP his profile, as his exact parentage is unknown and is likely to remain so since his male line has died out, meaning Y-DNA testing cannot be used to determine his family line.