Most English speakers would not know that the sound of 'c' in the Turkish alphabet is closer to the 'j' in 'joy'. The presence of the alphabet 'ç' also adds to more confusion.

https://en.wikipedia.org/wiki/Turkish_alphabet#Sounds

In Edinburgh there is "Cockburn Street", which is pronounced "Co-burn":

https://en.wikipedia.org/wiki/Cockburn_Street,_Edinburgh

(Also the Cockburn Association.)

Irresistibly reminded of http://www.lettersofnote.com/2009/10/we-all-feel-like-that-n... . Apologies.

But wouldn't Koc be pronounced something like "Kodj"?