Yes.

And B evolved from BCPL:

https://en.m.wikipedia.org/wiki/BCPL

I had read the book about BCPL by Martin Richards, creator of the language. it was quite interesting. IIRC, after describing the language, he gave some examples of small system software routines or utilities, written in it.

https://en.m.wikipedia.org/wiki/Martin_Richards_(computer_sc...