This name was borne by Saint Dwynwen, the Welsh patron saint of lovers. According to legend she was a beautiful princess who was visited by an angel.
This name was not regularly given to people until the 19th century [4][3]. It was used by George Eliot for a character in her novel Daniel Deronda (1876).
This name (in various spellings) has been common among European royalty, being borne by ruling queens of Naples, Navarre and Castile. Another famous bearer was Joan of Arc, a patron saint of France (where she is known as Jeanne d'Arc). She was a 15th-century peasant girl who, after claiming she heard messages from God, was given leadership of the French army. She defeated the English in the battle of Orléans but was eventually captured and burned at the stake.
Other notable bearers include the actress Joan Crawford (1904-1977) and the comedian Joan Rivers (1933-2014), both Americans.
The name Ororo was likely invented by her creators Dave Cockrum and Len Wein. In X-Men issue #133 of volume 1, Ororo states that "beauty" is the English translation of her name. In the comics she is stated to be Kenyan so it is assumed that her name is Kenyan; and in Swahili, which happens to be spoken by some people in Kenya, Ororo actually means "soft, sensitive, delicate". This may be a coincidence where the creators happened to chose a Swahili word, or the comic writers made a mistake with their meaning.