As an English name, Monica has been in general use since the 18th century. In America it reached the height of its popularity in the 1970s, declining since then. A famous bearer was the Yugoslavian tennis player Monica Seles (1973-).
As a given name for girls, it received some public attention from a character in the 1958 novel Parrish and the 1961 movie adaptation [1]. It experienced a larger surge in popularity in the 1980s, probably due to the character Paige Matheson from the American soap opera Knots Landing.