I'm puzzled by the search results page I got when I searched WikiTree (from the top of the profile page) for "Mary Hall," then sorted the results by birth date (I was trying to find and keep track of the various known duplicates and possible duplicate profiles for a woman born in the 1600s). The results covered the 1600s, but didn't include any of my target profiles:
What is it about the behavior of the search utility that prevented me from finding these? I noticed that most of the search results lacked married names. Some, but not all, of my targets had a married name at the time of the search, so I don't think that the search was consistently rejecting people with a Current Last Name other than Hall.