C# is much more recent than C/BCPL etc. What’s interesting, though, is how many of C these more modern languages are inspired by C. C is also very much still in use!
The name C++ is an inside joke as ++ is the C language increment operator, meant to imply that C++ is an improvement on C.
I have heard several times that the name C# was meant to look like the ++ had been added again to the name C++. The syntax of C# was chosen to be familiar to programmers that knew C++.
If we are saying old languages use letters for names and that newer ones use words, it is worth noting that C# was also heavily inspired by Java, which came first. Both Java and JavaScript are from 1995 ( iolder than C# ).
In the grand scheme, Go is not much newer than C#. Go is from 2009 and C# is from 2000. That might seem like a lot but Go was intended as an alternative to C which is from 1972.
C got its name as a progression over B, which started the whole single letter thing, but C syntax was chosen to look like ALGOL ( 1958 ). So we have to blame ALGOL for the look of C, C++, Java, C#, JavaScript, and even Rust.
Two of the oldest languages as FORTRAN and Lisp. Language names were often abbreviations ( such as FORmula TRANslation for FORTRAN ). Lisp was originally LISP ( list processing ) but the name Lisp, from 1960, fits right in with Go and Rust I would say.
The trend is certainly towards more whimsical names though. An early name for C was NB which stood for “New B”. If it were named like we do today, maybe it would have been called “Newbie” or some synonym of that. I kind of like Punk.
