I am not sure what the distinction is for the name. I tried as little as two letters and got a mountain of hits with a generic combination, I just typed in "ab" without the quote marks on the main search tab and got pages and pages of hits. I tried the same with kc, kci, kcig, kcige, and got nothing. I tried using my own name and only got two hits with "jon" or even "jonn" but got a whole bunch when using "jonny" - when I did the search test all were typed in without the quote marks. If you use quote marks in the search function, it will only return an exact match, not the string of letters.
Not sure what is happening here, must be something related to the way search works with forum names??
I am going to send the above to Peter to see if he can provide some clarification.
Later addition - did you use the main search tab, or the one on the right hand side of the screen? See the Pagoda Notes article on the search function for more detail. But the search on the right, just below the date, limits the search to the section of the forum you are currently looking at, and not the whole forum database.