Rajaratnam was born around 4 July 1884 in Kopay in northern Ceylon.[1]
Rajaratnam married Achchuvely.[2] They had three sons (Saravanabavanathan, Kathiresu and Satkunananthan) and four daughters (Kanagambigai, Yogambigai, Thilakavathy and Mangaiarkarasi).[1]
As its chairman, Rajaratnam played a key role in the foundation and growth of the Hindu Board which, at one time, managed more than 150 schools.[2][4][5]