Try it. It works if the comma is really there.
=TRIM(RIGHT(E4;LEN(E4)-SEARCH(",";E4))&" "&LEFT(E4;SEARCH(",";E4)-1))
If you want explanation of the formula e-mail me.
Good luck, hope it works
Of course E4 is just my sample cell, you'll have to change it to meet your requirements.
Have a nice day.
I would select the column and then goto Data Text To Columns select the Delimited Option and select the space option.
This would the separate the name into 3 columns you could then use the formula
=C5&" "&B5&" "&A5
to put them in the order you want.
then select the column and copy paste special values only
Hope This Helps