I'm assuming you have placed all the Full Names in Column A starting from Row 2.
Once you have done that, run the following macro:
Sub SeparateFirstAndLastName()
Cells(1, 2).Value = "First Name"
Cells(1, 3).Value = "Last Name"
For i = 2 To Sheets(1).UsedRange.Count
aFullName = Split(Cells(i, 1).Value, " ")
sFirstName = ""
For j = 0 To UBound(aFullName)
If j < UBound(aFullName) Then
sFirstName = sFirstName & " " & aFullName(j)
Else
sLastName = aFullName(j)
End If
Next
Cells(i, 2).Value = sFirstName
Cells(i, 3).Value = sLastName
Next
End Sub
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