Create a summary field, SummaryCountOfName which is the count of the NameField.
Create a calculation field:
NameCountUnique = 1 / GetSummary ( SummaryCountOfName ; NameField )
Sort the records by name.
If there are 4 records with the same name, each will show 1/4 in that calculation.
Create a summary field, the total of NameCountUnique
You could show that field, either in a sub-summary by name or grand summary.
Thanks so much. Your soulution was/is perfect.