Accurately Splitting Up Last-name / First-name From A Sharepoint Link Into A Query?

I'm trying to separate LastName, FirstName into separate fields : FirstName and LastName. The code I have is working for the most part. But I had to create a separate query with the replace statement to get rid of the ","... Looking at the data now, I had people with names like Mac Buren, Tony and I'm only picking up the Mac part in my query.

Code:
SELECT Left([Employee Name],InStr([Employee Name]," ")) AS qryLastName, Right([Employee Name],Len([Employee Name])-InStrRev([Employee Name]," ")) AS [First Name], Employees.*
FROM Employees
ORDER BY Left([Employee Name],InStr([Employee Name]," "));