Keogh coincidence

Well, - silly patterns of things again... I am organising a reunion for my father's family - the surname being Keogh, so lots of internet searching happening using that surname. So I went to post a comment on a blog just now, and the ending of the "code" that I had to recognise to publish was "jueogh". All it needed was the K in place of the U and there's my maiden name. So.... how are those codes generated??? Are they based on recognition of most frequently used key strokes in the past half hour or something like that???