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Identified errors:
This is not correct for Romania: officially it’s Surname + Given-name, live in Hungary.
Not true for Greece, it’s just First-name + Surname. It just happens that some Surnames are derived from the father’s name (think “Anderson”).
Very very long. I was entering a friend from Madeira into my phone a few weeks ago, and theirs was technically 7 names long.
Add to that the "so, which is your surname?" and getting 4 possible answers, all of which are in fact surnames.
There is also my friend who is half Spanish, half Portuguese. All his names shuffle around all the time depending on who he's speaking to.
When someone asks for my surname, sometimes I give my mother's surname, sometimes my father's surname and sometimes both, depending on my mood