I just inadvertently answered this in another thread.

CUPRA = CUP RAcing. It is a designation given to the performance cars in the 'Seat' brand of cars. Seat is part of the VW/Audi Group (VAG). They take production cars and take them to the 'CUPRA' facility and tweak them for more performance. Similar to SVT for Ford and SRT for Dodge here in the USA.

Well, I am originally from Scotland, and the last car I owned in the UK before moving here to the USA was a Seat Ibiza Cupra 20VT.

Below was my CUPRA - It's about the same size as a MKIV VW GTI - being as it's essentially the same car, built on the same chassis, same as the Audi A3 etc.

CUPRA was my screen name on forums in the UK, so it stuck when I moved here. It's a lot easier to get CUPRA as a screen name here in the USA that's for sure!