Slightly disappointingly, it turns out that the real name of Harry Knowles wife is Patricia Cho. Harry has been calling her "Yoko" on his website for some time now so presumably that has just been his running joke on marrying an Asian girlfriend.
In other developments, one usually informed source is adamant that Pete Shelley, lead singer and guitarist of UK band the Buzzcocks has married a Japanese girl. This would be somewhat surprising since Shelley is bisexual and seems to prefer the less fairer sex but it wouldn't be the first time for such a union. Another Japanese friend who tracks the comings and goings of old UK punk bands is equally convinced that it can't be true and a cursory search of the net throws up no real supporting evidence. He does like Japanese food, apparently. This is all I could find:
December 2000:
...As a footnote, years later me and my girlfriend (now wife) Beatrice were in a Camden Town pub gig when i saw "Pete Shelley" (Buzzcocks) amongst the audience at the bar. I thought i must say hello (pissed probably) and offered to get him and his Japanese girlfriend a drink (Guinness).
Charlie Harper of the UK Subs says:
Pete Shelley is a great mate and great person. I heard a funny story about Pete Shelley. He ran off with a young girl or something, because he had this Japanese girlfriend in London, but he’s run off somewhere, I think it’s South America to live in Rio or some place. When we were down there we heard these things