I’ve been in this boat and then had to justify the choice when integrating with third party vendors whose backends absolutely want names split into first/last components.
We would set up integrations sending the full name in the “first name field” and then a hard coded “notmylastname” string in the “last name field”. And then have about 3 days of back and forth usually including a link to https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-... and explaining that no, you can’t reliably use a regular expression to split the full name data into first/last components.
We would set up integrations sending the full name in the “first name field” and then a hard coded “notmylastname” string in the “last name field”. And then have about 3 days of back and forth usually including a link to https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-... and explaining that no, you can’t reliably use a regular expression to split the full name data into first/last components.