OpenSUSE :: Kmail And Address Book Search Function

When I try to write email, and enter the first few letters of the recipient in the "to:" box, it sometimes but not always autocompletes. i.e., let's say my contact's name is Frederick, his address is e.g. robertsharry@snotmail.com. I enter Fred or fred or fre, a couple of addresses come in to the autocomplete drop-down, but not his. After searching all over over to find his address by other means, I start to write it in manually only to find that he IS in my address book (and also in recent addresses), listed under Freddie. I know that the word Freddie is not in his actual address, but what is the point of having a search function if you have to remember the address yourself? In other words surely the drop down search should show display names (as well as any other fields)?