But why are they called algorithms? Back in the 9th century, a famous mathematician and astronomer made a lot of discoveries in science, math and the number system that we now use. His name was Muhammad ibn Mūsa al-Khwarizmī. His last name is Persian for the area of his birth: Khwãrezm. Over the centuries, as his fame grew, people outside the Middle East altered his name to Algoritmi. This version of his name would later be adapted as the English term that describes the step-by-step recipes we now known as algorithms. Bar Bet?