I got a call from a phone number that is not stored in my address book, and in the call log, under the number, a name was suggested: "Maybe: X" (where X is the guessed name).
Where is this guess coming from?
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iOS scans your email for contact info. If the phone number is not in your Address Book, for matches, it looks to your email to see if anyone with this number sent you email. If it finds the phone number associated with a contact from your email, it will show you "Maybe:" with its guess of the person's name.
You can disable this feature, if you want, by:
This is part of the Proactivity features new with iOS 9. It looks at info in emails to make an educated guess at who's calling.
On this Apple page, the new feature is shown and described.
Incoming call from an unknown number? If that number appeared in an email, iOS 9 lets you know who might be calling. And if someone sends you an email with contact information, the details can automatically be added to Contacts.
I believe there is a bug in iOS 11.2 that can result in "Maybe" being displayed even when "Find Contacts in Other Apps" is disabled (equivalent of iOS 10 "Contacts Found in Mail".
I turned iMessage off on my 11.2 device. Then I reenabled it. After doing that most, but not all, of my messages display with the Maybe: prefix even with "Find Contacts in Other Apps" disabled.
I've seen bugs with Spotlight and Contacts in iOS with large number of Contacts. I think this might be related.
So if you are using 11.2 you may need to wait for a bug fix.