"Because the security industry lacks a uniform way to title botnets, the result is sometimes a long list of names for the same botnet that are used by different antivirus vendors and that can be confusing to customers. As it stands now, the infamous Conficker is also known as Downup, Downadup and Kido. The Srizbi botnet is also called Cbeplay and Exchanger. Kracken is also the botnet Bobax. Why they are called what they are called is up to the individual researchers who first identified them.
"A lot of time it depends on the first time we see bot in action and what it does," according to Andre DiMino, director of Shadowserver Foundation, a volunteer group of cybercrime busters who, in their free time, are dedicated to finding and stopping malicious activity such as botnets. " – Content courtesy of How a Botnet Gets Its Name – CSO Online – Security and Risk