Source : Webster's Revised Unabridged Dictionary (1913)

Registrar \Reg"is*trar\ (-tr?r), n. [LL. registrarius, or F.
   r['e]gistraire. See {Register}.]
   One who registers; a recorder; a keeper of records; as, a
   registrar of births, deaths, and marriages. See {Register},
   n., 3.

Source : WordNet®

registrar
     n 1: a person employed to keep a record of the owners of stocks
          and bonds issued by the company
     2: the administrator responsible for student records
     3: someone responsible for keeping records [syn: {record-keeper},
         {recorder}]