When did men's names get added...

In 1979, to eliminate gender bias, men’s names were included to alternate with women’s names. Anytime a tropical disturbance intensifies, with rotary circulation and wind speeds above 39 miles per hour, the National Hurricane Center, located near Miami, assigns it a name. The names are chosen well ahead of time by the World Meteorological Organization at its international meetings. This organization establishes the lists of names, which rotate roughly every six years. In the case of a particularly severe hurricane, the organization may choose to retire that name from the six-year list and replace it with something else.