[x3blah]

"Also known as rump kernels a name inspired by the infamous purge of royalists from Parliament following the English Civil War this process involves creating a fork of an existing kernel codebase and manually purging it of the components deemed unnecessary to the target unikernel."

That appears to come from the FAQ on Github for "rumprun" dated 2015.

Rump kernels were introduced in NetBSD in 2009. It was an described then as an acronym for runnable userspace meta programs.

https://blog.netbsd.org/tnf/entry/runnable_userspace_meta_pr...

I have not used rumprun for Linux but I still use the rump utilities included with NetBSD.