Sir Oliver took that name. He was a Perera from Kandy.You might want to check some of my research re. the Goonetilleke and Gunatilleke families on the Sri Lanka Genealogy site. I am a descendant of the Kandy Goonetilleke's as well as the Mabole ones. I have not come across the family you mentioned. But my guess would be that it is one of the Goonetilleke families i am working on (same family tree, different branches). Check to see if it is a branch of the Goonetilleke family that went to the Orient (it might be elsewhere than Malaysia). .. the famous linguist etc.