Interesting - the author should work on the homepage search, because it's a single-word name. It can't be the length of the name either, it finds my profile. It can't be quiz count because it finds Terry who only has a handful.
My suspicion would be that the author has been inactive for too long (2009) to have been indexed; I will investigate this further!
It happened to me last week also, with author "miaow", also a long-gone member. I did find it using my profile Search, thanks to helpers here. And someone on the chat board had the same situation yesterday (I don't know the author in question there).