The docs refer to 'LK' (Little Kernel) as an inspiration for the lower levels of the design. It's another project started by Travis Geiselbrecht of NewOS fame.
To save others from bit of googling, apparently NewOS eventually became the basis for Haiku kernel, Haiku being FOSS re-implementation of BeOS. Travis also worked on some kernel stuff for BeOS, so that lineage makes some sense. Not sure if I missed anything?
Also see this comment thread: https://news.ycombinator.com/item?id=12271839
For example...different, but the lineage seems there:
https://fuchsia.googlesource.com/zircon/+/master/kernel/kern...
(Pdf) https://developer.qualcomm.com/qfile/28821/lm80-p0436-1_litt...