How did Sumatra get its name?

There are several theories about how Sumatra got its name. One theory is that it comes from the Sanskrit word "samudra", meaning "ocean". This theory is based on the fact that Sumatra is located in the Indian Ocean, and that the island was known to the ancient Indians as "Samudramandala". Another theory is that the name Sumatra comes from the Tamil word "sumatram", meaning "land of peace". This theory is based on the fact that Sumatra was once a peaceful and prosperous kingdom. Finally, some believe that the name Sumatra comes from the Arabic word "samaterra", meaning "land of the Arabs". This theory is based on the fact that there were once many Arab traders in Sumatra.