Neilson is a surname of Scottish origin, meaning the "son of Neil" or "son of Niall." It is a popular surname in Scotland and can also be found in other English-speaking countries. People with the surname Neilson are often known for their strong work ethic, intelligence, and loyalty. The name Neilson is derived from the Gaelic name Niall, which means "champion" or "cloud." Overall, individuals with the surname Neilson are often seen as confident, determined, and dependable.