I too was in the Yak-u-po-vich camp.I'm still not 100% on The Jak - I was still involved when he signed and all at the club then called him Yak-u-po-vich however all tv commentators now we've been in the Prem call him Yak-oooo-povich.
I also called him Flap-o-vich, before he became a hero, obviously.