I did this in the product where I work. We operate globally so having separate first and last name fields was making less sense. So I merged them into a singular full name field.

The first and only people to complain about that change were our product marketing team, because now they couldn’t “personalize” emails like `Hi <firstname>,`. I had the hardest time convincing them that while the concept of first and last names are common in the west, it is not a universal concept.

So as a compromise, we added a “Preferred Name” field where users can enter their first name or whatever name they prefer to be called. Still better than separate first and last name fields.