(French) form of Diana, now also widely used in the English-speaking world. It was especially popular among the Renaissance aristocracy, who loved hunting and were therefore proud to name their daughters after the classical goddess of the chase.
English and Scottish: patronymic from the personal name John. As an American family name, Johnson has absorbed patronymics and many other derivatives of this name in continental European languages. (For forms, see Hanks and Hodges 1988.)