Something like:
(defun c:MyLayout()
(command "expert" "2")
(setq shtnm (getstring "\nEnter new paper space layout description: (Example: 30x42-YourTitle) :"))
(command "layout" "t" "MyTemplate.dwt")
(command "MyLayoutTabName")
(command "layout" "rename" "MyLayoutTabName" shtnm)
(command "layout" "s" shtnm)
(princ "\nLayout renamed.")
(princ)
)