This is true even when grading school exams: teachers recognize the names of "bright" students and lean towards more positive grades.
That's why anonymous grading - and in scientific publishing, double-blind peer review is so important. It's part of the scientific progress just as much as replication, the attempt to re-produce results of a study post-publication by other groups (I wish papers' PDFs had a QR code to a Web page that said "double-blind review by x people, replicated by y groups" - the latter changes over time so it's better tracked externally).
That's why anonymous grading - and in scientific publishing, double-blind peer review is so important. It's part of the scientific progress just as much as replication, the attempt to re-produce results of a study post-publication by other groups (I wish papers' PDFs had a QR code to a Web page that said "double-blind review by x people, replicated by y groups" - the latter changes over time so it's better tracked externally).