Hi Catherine,
Thanks to George's information I suggested these merges. The best way to find existing profiles is to search using the name fields on the top of every page. For a common name like Barnes, I would search using the first name as well, then sort by birthdate. Then I scan the profiles at least five years before and after the birthdate. I do this before every profile that I add.
Feel free to reach out if you would like help with the merges.
Cheer, LK