I don't even have a phone number for Aimee. Amy is even marked as a favorite. Whenever I say "Call Amy" then Siri says "I don't have a phone number for Aimee."
It was working with iOS 9.
iOS 10.1.1, iPhone 5,1.
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If both people are in your Contacts, you can give one, or both, a nickname. When using Siri, you can refer to the person by nickname and Siri will know who you're talking about.
To add a nickname to a person:
add field -> Nickname
To remove a nickname, just reverse the steps. You can change the nickname at any time.