From the SecuriTeam blog

You can get hold of the first name / last name behind a gmail / google account. There’s a bug / feature in the google ecosphere that displays the first / last name associated with an account when you share a google calendar with that account.

A different way of getting to the relevant fields is :
- Go to the ‘Calendar Settings’ via the Manage calendars link, if necessary
- Go to the ’Share this calendar’ or ‘Shared: Edit settings’ link
- and add the gmail account to list of shared people

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