I can't say I'm that fond of Kiyriyaken or any other variant spelling.
As for Kyriakos...well, my cousin and I have fond memories of that name. In my culture, we pronounce it Qoor-YA-qoos (not authentic; we borrowed it from the Greeks) and it's apparently fairly common back in the old country.
My cousin and I once made up a guy named Hormus
Kyriakos and didn't realize till later that
Kyriakos is her dad's middle name. (And Hormus is a still-used contraction of Ahura Mazda, a Zoroastrian deity.) I wouldn't use it personally, though. It just makes me giggle.