Jean is the four letter answer to the crossword clue for Billie King. Billie King was an American tennis player who won 39 Grand Slam titles, including 12 singles, 16 women's doubles, and 11 mixed doubles titles. She was the first African American woman to win a Grand Slam title and the first female athlete to win the Triple Crown of singles, women's doubles, and mixed doubles at the same Grand Slam tournament. She was inducted into the International Tennis Hall of Fame in 1987.