It is a habit among astronomers, computer scientists, and others who run multiple computers to name them according to a theme. The names are an easier identifier, both over the network and mentally, than a series of numbers such as an IP address. Choosing a theme is indicative of the fact that they are all part of the same network, and managed by the same sysadmin.
My home computers (past, present, and future) are named as follows.
Former PC: Amalthea
Current PC: Ginger
Current iBook: Gir (3.1)
Future computer: Dory
For Gir, the 3 indicates it is the third essentially fresh start for the laptop, as the computer I originally bought was replaced within a month due to power management issues, and early last summer the motherboard equivalent was replaced after the video card died. The 3.1 indicates that while it came with OSX.3 installed, I upgraded to 10.4.
Your mission, should you decide to accept it, is to determine, not necessarily in order, (a) my scheme, and (b) the specific source of each name. It shouldn't be too hard to do, though I expect red herrings in one case.