[Rails] [Rails3] "Visitor" is a reserved word?

I cannot do the following on my freshly created and immaculate app:

$ rails g model Visitor

The name 'Visitor' is either already used in your application or
reserved by Ruby on Rails. Please choose an alternative and run this
generator again.

I checked the rails wiki, but Visitor doesn't appear as a reserved word.
What am I doing wrong?

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