First, add an Action between the Trigger (Facebook) and Verse.io (Action). Select Zapier’s app Formatter, then Text.
 

Next, choose "Split Text" under the Transform Field.

Under “Input” select Full Name.
Then type [:space] to indicate that the break between fields should happen when there is a space in the text.
For Segment index, select All (as Separate Fields)

When adding the First and Last name fields into Verse.io’s zap (SF pictured), the fields will be called “Output items” instead of “First Name” and “Last Name

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