I really am not fond of this name. The "K" seems random and out of place. Also, it would be misspelled often- but where I live there are two people in my grade with this name. If it was based off heritage I'd like it better, but it's a variant in Greek too. I understand why people use it though- Nicholas is even more popular. It's fine to name your child this, but I personally dislike it. Then again, one of the Nikolases I know feuded with me in orchestra.
I love this Greek form of the name Nicholas, it just looks so much more sharp to me, I love it. I was inspired by a certain Nikolas Cassadine of General Hospital ;]