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Hi AleishaB,
Thanks for your post in Microsoft Community.
If your cells A1 through A4 contain the values "Bradley", "Doyle", "Doyle", and "Doyle" respectively, you can try this formula:
=COUNTA(UNIQUE(A1:A4))
This formula will count the unique values in the range A1:A4. In this case, it should return the result 2, as there are two unique names: "Bradley" and "Doyle".
I hope the information above is helpful to you!
Best Regards,
Thomas C - MSFT | Microsoft Community Support Specialist