I thought the only Spanish words that used the letter K were words taken from other languages, but adopted by the Spanish (eg. Kilometro). Isn't the letter Q more usually incorporated into Spanish words and names ?
I was with a friend of mine who valets the cars for the Birmingham city players. One night we were in a bar in Dickens Heath and there were one or two of the players there with a foreign player who was on loan to Birmingham City.... they were teaching him to say "boll0x" and other such words. He had no clue... lol