By default, Cal.com booking page has a fullname text input field for the scheduler to put their name in. This usually works just fine for most people. However, at times, it is preferable to take the firstname and lastname of the scheduler as separate inputs in the booking form. Cal.com provides the option to split the fullname input field in the booking form into firstname and lastname. To do that, you can do the following:
1

Access Event Type Settings

Head to the event type settings where you wish to split the fullname into firstname and lastname.
2

Click on Advanced Tab

3

Scroll to Booking Questions Section

4

Click on the Edit Button in Front of Your Name

5

Click on the Toggle

In the dialog that opens, click on the toggle that says Split "Full name" into "First name" and "last name"
6

Fill the label and optional placeholder values, and click on save

Fill the label and optional placeholder values, and click on save.
7

Save Changes

Remember to click on the save button in the event type settings as well.
8

Check the Public Booking Page

Head to the public booking page of this event type, you will notice the fullname is now split into firstname and lastname with the labels provided by you in step number 6.
You’re all set!

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How this affects the Booking API requests

Please note that in case of API requests, your usual responses object: 
"responses": { "name": "John Doe", "email": "john.doe@example.com", "location": { "optionValue": "", "value": "Acme Industries" } }
will now be updated to allow name to be converted into object containing firstName and lastName as follows: 
"responses": { "name": { "firstName": "John", "lastName": "Doe" }, "email": "john.doe@example.com", "location": { "optionValue": "", "value": "Acme Industries" } }