I've always been called Wookey - ever since I went to the sort of school where they just use your surname when I was a kid. Eventually I decided to make it official (by Statutory Declaration) and drop my first name, so since 1987 I've been 'Wookey' (no fornames or initials).
These days I get a lot of aggravation from web-forms that insist everyone should have two names. Please - if you are writing web forms, do not make it impossible to use your system without two names. Would you really prefer that I made up a name in order to buy something (possibly somethign important) from you? Possible approaches are to enter name as one field, or to allow one or other field to be blank and go to a '>name< field left blank - is that really correct?' page. e.g. as at http://www.bytemark.co.uk/
Due to this not be done very often I am often 'XXXX Wookey', but that's definately not really my name. That would be silly.
Only having one name can be a bit of a pain sometimes, but it does also have hidden advantages. For many years the Phone book software obviously couldn't cope so I was ex-directory for free. I sure it helps protect against cross-organisation datamining, and from time to time I reckon scripts and database queries break and ignore me - which can be either a plus or a minus, depending on what they were going to send with the info. It also amuses passport officials the world over, who sometimes have to go and show their mates (I guess loooking at everyone's passports isn't a very exciting job). Occasionally I have to be rescued by my wife who promises that I am merely a harmless weirdo and if they just let me in to the country no harm will come of it.
Perhaps the most amusing part is financial institutions who insist that it must be fraudulent to only have one name and I can't possibly be who I say I am. Clearly giving them the _wrong_ name might be fraudulent, and if I did want to cause trouble I wouldn't use a particularly recognisable name, and then make them take notice by arguing about web-forms and processes. They all seem incapable of understanding this simple truth. Latest tiresome outfit is facebook, who insist I can't join without forwarding goverment-proivded proof of I.D, even though you can join with any 2-part name you care to choose. Idiots.