I like the convention. Even if you pick a word that isn't very common, you are still unlikely to be able to register a domain name for that word, and will have to amend it somehow, and search engines will still have to guess which use of the word you meant. Having a common convention simplifies searching for things, as opposed to having to type out "Rust Programming Language" every search.

First result in Google for "Rust" is this:

https://store.steampowered.com/app/252490/Rust/

Rust the language is three years older, but I suppose those who bought the domain were aware that it's a common noun likely to be used elsewhere.

Lisp does it too (https://lisp-lang.org/) - I think it's a reasonably familiar convention

I'm not talking about domain names. I'm talking about people referring to the language itself as, for example, Rustlang.

Right, but the colloquial usage stemmed from the domain name :)

I don't think I've actually seen anyone refer to it as Lisplang.

"Rust", "go", "cell", all of those words have a preexisting meaning which is more common than the corresponding programming languages.

This is true of everything that is named after something, and it wasn't really something people worried about until Go, which is interesting in itself.

I think the internet was less pervasive before, so it mattered less for C, C++, Java, and it matters a lot more now.

So now, if you want to call your language Duck or Car, you better add that "-lang"! It seems to work well enough.

Well, "cell" isn't too searchable either

"Cell" is going to have lots of search-collisions, and it can also help with finding a domain name

Odin is one language that could use this convention. My Searches often turn up things on The Odin Project.