lispdoc - results for nth-value 

(nth-value n form)
Function: Evaluate FORM and return the Nth value (zero based). This involves no consing when N is a trivial constant integer.
Example:
(defun ajax-function-name (fn)
  (or (sb-kernel:%fun-name fn)
      (string
       (nth-value 2
                  (function-lambda-expression
                   fn)))))
Mentioned in:
CLtL2 - 7.10.1. Constructs for Handling Multiple Values
HyperSpec - Macro NTH-VALUE
(alexandria.0.dev:nth-value-or nth-value &body forms)
Function: Evaluates FORM arguments one at a time, until the NTH-VALUE returned by one of the forms is true. It then returns all the values returned by evaluating that form. If none of the forms return a true nth value, this form returns NIL.
  

By Bill Moorier