From the Eclipse Public License (EPL) 1.0 FAQ and the EPL 2.0 FAQ:
Can a Contributor remain anonymous?
No. Except for those who simply redistribute the Program, each Contributor must identify itself as the originator of its Contribution in a way that later Recipients will be able to readily see.
Why can't the author be anonymous when the license is EPL-1.0 or EPL-2.0, although copyright law allows anonymous works to be copyrighted?