[jotaass]

It's quite usual to have two family names, one from your mother's side and another from your father's. Usually the father's family name comes last, but it's by no means a rule, more of a social norm (and somewhat fading).

Additionally, it's also perfectly reasonable to have two or more "first names".

The consequence of all of this, and having four names myself, is that I'm always confused what I'm supposed to fill in as my first and last names. I end up using just my very first and very last, but i always feel like I'm being disrespectful towards my mother's family for the omission.

[cgore]

Something similar used to be common with the english too. My great-great-great-great grandfather was "Thomas Tindall Gore", and Tindall was his mother's maiden name. This sort of thing was quite common all throughout the 1700's and 1800's, but seems to have went out of style in the last hundred years or so.

[akavi]

I actually assumed, well into my teenage years, that people's middle names were their mother's maiden name, as that's the case for me, my sister, and my cousins.

[cgore]

Another interesting one I would see a lot is <mother's father's name> <father's father's name> <last name>.

For example, My dad was Charles Marvin Gore. His mother's father was Charles Maltbie. His father's father was Marvin Gore.

I don't think I ever saw the two modes combined though, so no example of a Charles Marvin Maltbie Gore. Although that is just in my family. It might have happened in others.