": ""Spion Kop"" is the spelling that's most common in English. To confirm this, I did a Google search, restricted to pages in English. I got: 

 :* ""Spion Kop"" - 6,330  
 :* ""Spioenkop"" - 1,490  
 :* ""Spioen Kop"" - 37 (just to check to see if this gets any use) 

 : Since policy on the English Wikipedia is to use the English version of names, please leave it where it is. Thank you.    

 "