See attached for a suggestion..
If you can re-organize the 3 tables one under the other as per attached.. then add several helper columns (that can be hidden, if desired).
So in J4:
confirmed with Ctrl+Shift+Enter and copied down and across 3 columns.... this extracts all names associated to each object over the years.
Then in M4:
confirmed with Enter... this counts unique entries
In N4 (similar to J4 formula but extracts helpers):
confirmed with Ctrl+Shift+Enter and copied down and across 3 columns.
Formula Q4:
copied down
To gather relevant data, in H4:
copied down
and in I4:
copied down.
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