vānarapura should be the correct name instead of singapura as there were monkeys with manes that lived in the jungles of sg then.Induans influenced arabs with their mathematics, from the number zero, to infinity.
Name Singapura is dravidian in origin. There were no lions in singapura. But there were in india but hunted down till extinct.
Most of the sultans i believe are of indian, middle east or turkic descent. Kedah sultanate have the oldest lineage since chola dynasty 1000 years ago.