What is the birth name of Dirty Bob?

There is no widely recognized individual known as "Dirty Bob" in the public domain. It is possible that this name is a nickname or a fictional character.

To help me identify the person you're referring to, please provide more context, such as:

* Is this a real person or a fictional character?

* What is the context in which you heard this name?

* Do you have any other information about this person, like their occupation or location?

With more information, I might be able to identify the person you're asking about and provide you with their birth name.