Definition of "namer"

"Tony, I'm the executive director of S.H.I.E.L.D., the Strategic Homeland Intelligence, Enforcement, and Logistics Division," explained Fury.Tony nodded. […] "Want a tip? Fire your namer of things, because that's a mouthful."

2010, Alexander Irvine, Iron Man 2: The Junior Novel, page 77

It was that veteran namer of geological periods Charles Lyell who coined the term Pleistocene.

2018, Tim Flannery, Europe: A Natural History, page 145