The Collaborative International Dictionary of English v.0.48:

Khan \Khan\, n. [Pers. & Tart. kh[=a]n.] [Also kan, kaun.]
   A king; a prince; a chief; a governor; -- so called among the
   Tartars, Turks, and Persians, and in countries now or
   formerly governed by them.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Kan \Kan\, v. t.
   To know; to ken. [Obs.] See Ken.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Kan \Kan\, n.
   See Khan. Kanacka

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

KAN
       KriminalAktenNachweis (INPOL)