I have a `User` model with a `name` attribute. In my `PagesController`, I want to set an instance variable equal to all of the User objects, but I want to order them based on last name. I know I can do:

`@sortedusers = User.order(:name => :asc)`

to order the users based on their `name` attribute, but how do I do it based on last name? (i.e. how do I order the Users based on the *last word* of their `name` attributes?

Thanks.