Further improvements to deduplication/Merge & Fix

People with a single last name in one contact, and multiple last names in another

People with just their first name in one contact, and their first + last in another

People with just their email address (no name) in one contact, and their name in another

People with a misspelled name in one contact, and the correctly spelled name in another

People with their names written "Last, First" in one contact, and "First Last" in another

People with prefixes in one contact (Dr., Mr., etc.) and not in another

People with their maiden name in one contact, and their married name in another