If the word is Bob, then the name itself cannot be copyrighted, although it could be trademarked. However, in your situation, there will be no copyright or trademark infringement issues since you are merely using the word Bob in a completely different context.
The same thing would apply to your question regarding the group of words. (There could be trademark issues if you are using the group of words in an attempt to capitalize on the video game itself).
Attorney
8+years of experience in all matters of civil litigation and Hearing Officer/Arbitrator