Personally, I don't think adding guile prefix to a package name is the way to advocating Guile, unless it's Guile specific program and used by Guile only.
GNU Artanis is written in pure Guile scheme, but the name doesn't imply any guile stuff. If people like it, then they will like the power of Guile. But if they know little about Guile, they may afraid of using it when they see Guile-webframework as the name.
It's not so easy to let people accept a new language. So I think it's better to avoid such implication.