The idea of naming cyclones sequentially dates back to WW2 when US was bombing Japan. The bomber crews were at it night and day and didn't know one bunch of bad weather from another. During the cyclone season there is a new cyclone every week and often 2 or 3 on the map at once so they were named using the phonetic alphabet (alpha bravo etc). In the late 50s this evolved to a boys names alphabet, and in the late 60s to a boy/girl alphabet. In Guam and the Caribbean the alphabets are reset to A at the start of each season but this is not the practice in the South Pacific (which average about 9 storms per season).
VAUGHAN is just the one of three this year in the Brisbane area (Steve , Tessi, Vaughan) and my memory only reminds me of Leo and Mona in the rest of the South Pacific. There may have been 2 or 3 more perhaps in Nov/Dec 1999...check http://www.solar.ifa.hawaii.edu/tropical/ for more details.
The word HURRICANE is reserved for winds over 63knots (sustained average). The word cyclone just means an area of spinning wind. Its a generic term, even anticyclones are "cyclones" (going the other way).
The term "Tropical Cyclone" is used to refer to Tropical weather systems that are spinning so that they have a ring of gales (at least) near their centre. If it's spinning but not yet a gale it's called a "Tropical Depression". Tropical cyclones that are spinning faster than 63 knots (sustained average) can thus be called Hurricanes (or, in Asia . Typhoons) . Only a few tropical cyclones reach this status. In Australia and around South Pacific the term Hurricane is popular and sometimes even used to describe tropical cyclones that are not strong enough to deserve the name hurricane.
Cyclone are categorised according to the rate they spin - if less than 33knots (sustained average) , its a Tropical Depression, not a cyclone.
Category 1 (Gale)
Category 2 (Storm)
Category 3 (eg. Winifred)
Category 4 (eg. Tracy)
Category 5 (eg. Orson)