That breaks for chinese, japanese, korean, and probably multiple other types of names.
s/first name/given name
s/last name/surname
But this has it own issues, like assuming people have either a given name or a surname in the first place.
My native country, Norway, went through an assimilation period of standardising surnames a few hundred years ago. Before that your name often was in 3 parts:
First names(s) - father's name - farm/manor/village.
So names were something like "Ivar Ragnarsson of Torp" or "Sverre Haraldson Bjerkeli". (With the -son bit to say whether a son or daughter).
With assimilation into standard more Continental Christian Danish society and most likely standard registration for tax - people dropped either the farm name or the father's name in their names. And froze the father's name in the surname in future generations. And changed the -son to a more Danish -sen for all genders. So, since the 1700s people have just 2 parts to their names. Unlike Iceland which has kept the naming tradition.
However,... what is common again today is to have 2 surnames. One from each parent. Unhyphenated. Similar to the Spanish convention (first-name - father's surname - mother's surname) but not as standardised, and mostly opposite order with father's surname at the end being the official family surname. And that makes internationalised computer systems so complicated.
My children have both our surnames, both by choice and necessity so either of us can get through passport control with them. (mother's surname - father's surname). But they had to have their surnames hyphenated to be able to register their births and British passports. Which still angers me today as my family convention of the latter surname being the main one is now mostly ignored.
Bob Jones Alexander Richardson Hill
I know in England there was a tendency of people keeping both names of powerful families[1][2], then as double-barreled surnames. Which then sometimes went a bit nuts a few generations later if they married into other double-barreled families [3].
I think it was when I visited Stowe School, the seat of the Dukes of Buckingham and looked at the family tree, that I even saw some surnames repeated if they married into other families which shared one of their multi-barreled surnames...
[1] https://www.theguardian.com/lifeandstyle/2017/nov/02/keeping...
[2] https://www.telegraph.co.uk/family/parenting/are-we-heading-...
[3] https://en.wikipedia.org/wiki/Richard_Temple-Nugent-Brydges-...
I do not see this as a problem. If i know English so i can fill english-labeled form on english webpage, i would also have a bit of cultural knowledge to translate first name to given name and last name to surname.
> But this has it own issues, like assuming people have either a given name or a surname in the first place.
This is only a problem if the form validates that both fields must be non-NULL. Problem is not with the split itself but with the validation code.