Is there an alternative to Dean title? Because of different backgrounds in higher education systems, different titles are popularly used for administrative titles in academia such as


  University level - President, Vice Chancellor, Rector, Principal
  
  Faculty level - Dean only
  
  Department level - Head, Chair


For leading a faculty, the only common term is Dean. Am I right? or there are other alternatives too?

And more interestingly, the title of Dean is only used for the manager of a faculty, not other positions. Correct me if I'm wrong.

What is the historical meaning of dean, and what is special about this title, which is only used for a specific level in academia.
The title "Dean" is by no means restricted to the leader of a faculty (or college, or other similar unit). For instance, most US universities have a "Dean of Students" who is responsible for student services, discipline, etc. Some have a "Dean of Residential Life" who runs the dorms. My alma mater had a "Dean of Student Activities", popularly known as the "Dean of Fun".