It's pronounced Guy-us, and was a very common Roman name so a fair number of people will be aware of it, even if they've never actually met anyone who uses it before.Tom_green_day said:With a first name that is gay-us? Yeeeeeah while PC you may be toeing the line, you'll get teased and pro-LGBT people might feel you're mocking them.
EDIT: Damn, ninja'd!