When I see BUU::IRC, I think, "I wonder what BUU is. Why do people want to connect it to IRC?"
Sure, as someone said, you're creating some kind of connection between you and your module. Very few people will understand that, though. Even if it was abundantly clear, it would be redundant. Your modules are already stored under your name, and with your name plastered all over them. No one is going to say, "Finally! I can be reminded of the author's name every time I C<use> his code!"
Find something descriptive. How does your code improve on Net::IRC? Is it faster (Net::IRC::Fast)? Is it easier to use (Net::IRC::Simple)? Is it just an alternate take (Net::IRC::Neo).
Your code deals with IRC. IRC is a network protocol. Your code belongs under Net::IRC.