Right. But full name gives the issue I just mentioned above.

If someone's name is super long "Christopher Alexander Worthington" and I store that as full name.

Or someone enters "S. Smith" as the full name.

I could either put the whole name in emails "Christopher Alexander Worthington requests signature" or "S. Smith requests signature".

But in cases where I just want first name, I have to "guess" and hope that split [0] display makes sense.

"S. is inviting you to ..."

I feel like I'm better off sticking to first/middle/last and having people conform to that, given the limitations.

If I need to do invoicing I can just construct the name. For less formal things, I can just pick the first name which is required anyway (and last name).