This was the name of kings of England, Serbia, and Poland, as well as ten popes. It was also borne by the first Christian king of Hungary (11th century), who is regarded as the patron saint of that country. More recent bearers include British physicist Stephen Hawking (1942-2018) and the American author Stephen King (1947-).
In England and elsewhere in Europe during the Middle Ages this name was used in honour of the saint. However, it was not generally given in Ireland before the 17th century because it was considered too sacred for everyday use. It has since become very common there.
This name was borne by a 6th-century Byzantine emperor. Another notable bearer was Maurice of Nassau (called Maurits in Dutch), a 17th-century prince of Orange who helped establish the Dutch Republic. The name has been used in England since the Norman Conquest, usually in the spelling Morris or Moris.
Though this name is borne by the American actress Glenn Close (1947-), it has never caught on as a feminine name.