I once decided to change a real name to a fake name in a book I was writing, to avoid embarrassing someone who might not want to be written about. I also thought I might get sued for what I said about her.
I used Word’s "Find and Replace" feature, which quickly made about a dozen substitutions in a chapter.
But when I read through the chapter I was surprised to find a few instances of the old name which had escaped the Find function. It’s important to do a manual verification, because Word might not notice hyphenated words or words with apostrophes or in their plural form as targets for replacement. Don’t risk a lawsuit by leaving in a wrong name or word.