[Waterluvian]

Is there a website one can test names against? Of course you can locally but that doesn't easily cover the distros you might be thinking of targeting.

[abathur]

I doubt any of these will help you if you pick the name of a shell builtin, but:

The closest (but not perfect) answer I know of is the open source project name checker (http://ivantomic.com/projects/ospnc/).

Repology (https://repology.org/projects/?search=what) can also help a bit, but it's less of a direct answer.

[ckuehl]

Another thing that isn't perfect but could help is doing a search of package contents of a large distro, e.g. here's a search of Debian for packages that provide a file called "node": https://packages.debian.org/search?searchon=contents&keyword...