In https://minnie.tuhs.org/pipermail/tuhs/2020-January/019955.html ,
Brian Walden wrote (which looks like a reliable source to me):
"GWRL stands for Gottfried W. R. Luderer, the author of cut(1) and
paste(1), probably around 1978. Those came either from PWB or USG,
as he worked with, or for, Berkley Tague. Thus they made their way
into AT&T commercial UNIX, first into System III and the into System
V, and that's why they are missing from early BSD releases as they
didn't get into Research UNIX until the 8th Edition.
I knew Dr. Luderer [...]
I also briefly worked for Berk when he was the department head
for 45263 in Whippany Bell Labs before moving to Murray Hill."
Obtained from: OpenBSD
MFC after: 1 week