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Einstein
While the Greek mathematician "Euclid" had no surname, he was known as "Euclid of Alexandria" and was often referred to as the "Father of Geometry".
Shiyali Ramamrita Rangnathan's father name was Ramamrita Ayyar... So His surname was Ayyar...
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A surname is also known as a last name or family name. A surname comes after the first or given name, and the middle name or initial, if there is one.