Clamshell brainteaser: Who is Robin?

One day when i tried to install a new hard drive in a graphite firewire clamshell, i found the word Robin punched into the heatsink. Maybe a clever sort of unique identification in case of theft? But over the years, i did find two other Robin heatsinks in Clamshells from different parts of the world. Who is Robin? Did you find other words - Lady Marian for example? What is it good for - any suggestions?