 In the old Dutch spelling, the family name had been spelled "Sastrowardojo" but, even prior to the spelling reform in Indonesia in 1972, some members had changed the "j" to a "y"—and one brother, Sudibbyo, spelled the name "Sastrowardhoyo," reflecting the aspirant "d".The family name was derived from "sastra" (Sanskrit, 'writings') and "wardaya" (Sanskrit, 'heart'), so literally meant "writings of the heart.