The US weather began naming storms in 1953. The list was made up women's names. Later, men's names would also be used.
Each hurricane season, the first storm gets a name that begins with "A". As news storms arise they are given names that begin with the next letter in the alphabet. There are now six lists of names (one for each year for six years). After six years the lists are used again.
Among other things naming hurricanes facilitates, it makes it easy to know how many hurricanes have occurred in any season. (For example, a hurricane with a name that begins with the letter, "D", is easily recognized as the fourth hurricane of the season.