Hi Kaper, thanks for all your input
My above requirement had a major flaw which was that the name would highlight once this meant that I wouldn't be able know the number of times the name has appeared in the workbook. Hence my previously proposed macro was flawed.
What I ended up doing was that I created a new column and used countif function that counted the number of times the name appeared in the previous tabs.
If the name matched it would return the number of times it matched. If it didn't match it returned 0. Also, it changed the background color to blue if the number was >0
I used the following code for december's sheet:
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