AlanBarr:
I've often wondered what the rules actually are for a name to go on a birth certificate. Are you limited to the 26 alphabetic characters? Does it have to be pronounceable? Is there a limit on number of characters? Presumably each country has its own rules.
I'm no expert. Anybody chime in who knows better. Here in America, we usually conform to the first, middle, last name. Lately, some have been adding the mother's maiden name, as a pre-surname. but that's all manner of ridiculous to me. Some try to skirt by with two first names with a hyphen between, likewise. My sister took my mom's first and middle name for her middle name, then legally changed her last name to my mom's last name (because she was too embarrassed by my family name too). So she has four names; first, first middle, hyphen, second middle, last. That she isn't married and has a name-change means she has to carry and pull out a fist-full of legal documents every time she tells someone her name.
Pilot Inspektor Reisgrath-Lee is a famous non-standard/multiple name. Moon Unit and Dweezil Zappa are likewise for non-standard, but use only three names.
I don't know if there are a standard maximum of letters per name, but most forms have a letter allotment of 20 letters for first, middle initial, 20 letter last. I counted things like that back in the day. This is most school forms, or driver's license forms. I never had to fill in a birth certificate.
In South America, I had the misfortune of buying a commissioned piece from one artist and sending him money. The telegram person looked at me like I had three heads when I said he had 6 names. first-first, second-first, first-middle, second-middle, mother's Maiden, father's Surname. And he told me, his country didn't allow him to pick it up if all of those names weren't on the form.
In America, when I was a kid, a funny child's song was "John Jacob Jinkle Heimer Schmidt" because it's funny to hear so many names.
I'm not aware of the 26 alphabetic letters and what is permissible or not, but doubt we have any non-standard characters. We just don't have the keyboards for it, and (I'd suspect) anything used otherwise is probably hacker fonts. That IS how hackers work.