Here is what I have used for Concatenating names but I am new to Excel so I
may not fully understand what you want.
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Where Cell C3 is the First Name and Cell B3 is the Last Name.
=CONCATENATE(C3," ",B3)
Will yield..............FirstName LastName
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Where Cell B3 has the Last Name and Cell B3 has the First Name.
=CONCATENATE(B3,", ",C3)
Will yield.............LastName, FirstName