This name was popularized in continental Europe by the works of the 18th-century Scottish poet James Macpherson [1]. Napoleon was an admirer of Macpherson, and he suggested Oscar as the second middle name of his godson, who eventually became king of Sweden as Oscar I. Other notable bearers include the Irish writer and humorist Oscar Wilde (1854-1900) and the Brazilian architect Oscar Niemeyer (1907-2012).
In the early Middle Ages the name was adopted by Norse raiders and settlers in Ireland in the form Njáll. The Norse transmitted it to England and Scotland, as well as bringing it back to Scandinavia. It was also in use among the Normans, who were of Scandinavian origin. A famous bearer of this name was American astronaut Neil Armstrong (1930-2012), the first person to walk on the moon.
The biblical Moses was drawn out of the Nile by the pharaoh's daughter and adopted into the royal family, at a time when the Israelites were slaves in Egypt. With his brother Aaron he demanded the pharaoh release the Israelites, which was only done after God sent ten plagues upon Egypt. Moses led the people across the Red Sea and to Mount Sinai, where he received the Ten Commandments from God. After 40 years of wandering in the desert the people reached Canaan, the Promised Land, but Moses died just before entering it.
In England, this name has been commonly used by Christians since the Protestant Reformation, though it had long been popular among Jews.