Yes, "Cloud" is a real name. It's a surname with origins in England and some Native American families. It's a topographic name for someone who lived near an outcrop or hill, derived from the Old English word "clūd" meaning "rock."
The name "Cloud" was found in the USA, the UK, Canada, and Scotland between 1840 and 1920. The highest concentration of Cloud families was in the USA in 1880.
However, "Cloud" also gained popularity as a fictional character name, most notably with Cloud Strife, the protagonist of the popular video game Final Fantasy VII. This fictional character's name is a deliberate choice, as the kana in his name can also be read as "Claude Strauss," a real-world German name.
The name "Cloud" may also be used in other contexts, such as in cloud computing, which refers to the delivery of computing services over the internet.
