Footnotes and Index

Question

I am compiling an index of names from the text of a book.
The book has footnotes, which are at the bottom of each page.

I want to include names *only* from the main text, excluding the footnotes.

But if I select a name from the main text for my index and then click on
"Mark All" on the index-making box, it marks the name in the main text and in
the footnotes.

How do I exclude the footnotes from my Index?
Thank you
--

Phyllis