What is my name in England?

Today I had to fill in a form where I should write my name and surname. When I've wrote this information, the man asked me which one was my name and what was the surname. I answered him that I have 3 names: José Luis Jorge and two surnames: Pueyo Caudevilla.

They have problems with these issues because English people usually have one name and one surname. If you write two names and two surnames, the computer could return a wrong answer.

I thought if I say that I was born in Onecastle (Uncastillo), he could think I am a aristocrat.

So, I've decided that in England my name it will be José and my surname only Pueyo. Funny, isn't it?