How to find crm field name (not field label)

How to find crm field name (not field label)

Zoho Cares is no help - they demand a screenshot - a screenshot makes no sense, completely non-applicable. Clearly someone is telling reps "always get a screenshot" arggg. Now it's the weekend and this is a critical issue for us.

Here's an explanation of the issue.

What are the actual field names? Not the field labels.
I can't use a text label for a field reference when writing a function.
But it seems like the field name is nowhere to be found.

Example:

Let's say I want to break a first and last name into a two element list.
I would write:
fieldname.toList(" ");

But I can't because the fieldname is listed nowhere.
Let's say the field label is: "First Name".
Well, I can't use that, as I'd end up with a two element list containing "First" and "Name"
Why is everything in Zoho so difficult?