This is kinda weird... Yeah, they can get big. Most usual is to have 4 names (2 first names + mother + father)
Anyway, it's kinda weird because I wouldn't give anyone more than first and last name... And that's what most people do, (unless we're in the rare situation where two people share the same first + last name). Why was your friend making you write his full name?
Documents always start with a surname in most countries. But traditional name order in Ukraine is as pictured, because it comes from orthodox Christians church. Same as in Greece, for example. Most people today don't use father names anymore though.
The map shows a split between the Catholic and orthodox church with a few countries being an exception from the rule.
In Spain of course your parents have 2 surnames too.
So your first surname is your father's first surname, his 2nd surname is dropped ( first surname of his mother )
Your second surname is the first surname of your mother, her 2nd gets dropped too.
In the end always the name line of the females get dropped.
That's so shitty. In the Netherlands they've just started to allow 2 surnames. One of the best proposals I've heard is that you would take your father's father's name, and your mother's mother's name. That way men continue the male name line, and women continue the female name line.
Historically, yes; however, they passed a law some years ago to allow for the mother's surname to be the first surname, as it happens in Portugal. Nonetheless I am not sure how popular this is.
What happens on blue countries when mother and father don't have the same surname? For example when they are not married or the mother didn't bother to change her surname