Version control log tab filtering by user with comma in name

I try to filter the git commits by user, using the User filter option on the log tab of the version control window. I choose "Select..."

The git users at the company I work for are named as Lastname, Initials (Firstname). Note the comma between the last name and the first name.

When I try to search, Intellij interprets the comma as a separator between user names. This is not desired. How can I make it do the right thing and find the user I'm looking for?