 Mononyms are also common in Indonesia for Javanese individuals, both prominent government figures such as former presidents Sukarno and Suharto and commoners such as Triyatno.Most Icelanders do not have surnames, only patronymics (sometimes matronymics), and they address each other by their given name in both formal and informal situations.In modern times, in countries that have long been part of the East Asian cultural sphere (Japan, Korea, Vietnam and China), mononyms are rare.