Apologies if this question is not fit for this website. I thought it was the best one to put it.
I come from a country (Brazil) where the naming custom is: Given name + Mother's maiden name + Father's name. This is also the custom in Portugal. Not everyone follows it in Brazil though, my family is of immigrant background there and everyone in my family follows the convention Given name + Fathers name only. It is not mandated by law.
For instance: Alice Sneijder marries Peter Smith, their son would be Bob Sneijder Smith.
Now, I have moved to central Europe, where the custom is only Given name + Father's name. Initially, I just used my full name at all times. However, many times this yields confusion, as they do not know whether it is a middle name or not, if it's from Spanish-speaking countries (where the mother's name is the last and generally not used).
My friends from spanish speaking countires also have three names, but normally they use only two (the given and the father's).
I would like to know if this is possible. For instance, if I sign a document where my name appearsas only "Bob Smith" and not "Bob Sneijder Smith" is it problematic? Does it lose legal value?
I tried removing my mother's maiden name but that is not easy. I am also a citizen of Italy where the convention is also given + father and this is also generating confusion.
What are my alternatives? Can I do like my spanish speaking friends and just omit my mother's maiden name? I talk about official things, ex: signing a lease, buying property, signing a job contract, etc...