Original: The spelling '' Sukarno '' is frequently used in English as it is based on the newer official spelling in Indonesia since 1947 but the older spelling Soekarno , based on Dutch orthography , is still frequently used , mainly because he signed his name in the old spelling .
Simplified: The spelling '' Sukarno '' has been official in Indonesia since 1947 . The older spelling Soekarno is still frequently used , mainly because he signed his signature in the old spelling .