Yeahhh currently considering going through the legal name-change process to move one of my family names to a middle name or something. It's made all the worse by the fact that my parents didn't always use both family names when I was growing up, so some legal documents disagree on what my "last name" is.

I can sympathize, the Spanish naming system makes things legitimately complicated sometimes. My wife has a Spanish style name Firstname(s) Fathername Mothername. But very very often she just goes by Firstname Fathername but it's not technically her legal name and is confusing in the non Spanish world because people assume otherwise that Mothername is her last name.

So for our son we decided to try to skip any confusion by doing what you are alluding to, and making her Fathername into his middle name, and giving him just my last name, in the English style.

And it worked, sort of, but then we discovered it was absolutely not legal to do that in my wife's country of origin. So kind of hilariously his registration in that country is: Firstname Mothername Fathername Mothername.

They forced us to repeat the middle name as part of his last name too. Just ridiculous. I thought at the least they would allow us to reverse them, but no.