CNContactMiddleNameKey The contact’s middle name. Declarationlet CNContactMiddleNameKey: String DiscussionThis key takes a string value. See AlsoNameCNContactNamePrefixKeyCNContactGivenNameKeyCNContactFamilyNameKeyCNContactPreviousFamilyNameKeyCNContactNameSuffixKeyCNContactNicknameKeyCNContactPhoneticGivenNameKeyCNContactPhoneticMiddleNameKeyCNContactPhoneticFamilyNameKey