And you're right, Google legal is not easy to go up against. But maybe they haven't yet been consulted on this plan and would agree with a politely but firmly worded letter from him on the naming question specifically. The original public source of these Google plans is merely an issue in the Chromium bug tracker, not yet a fully vetted blog post or press release.
Though it would probably be prudent to try sending an email with "hey, do you mind changing your name to something else" first.
Then again, given the article and a bit of HN Buzz, that may already be happening.
Definitely worth you pointing out the rights that the author likely has in the comments though.
I'm not looking forward to people mistyping libcrurl as libcurl and people having to second guess what the intention was.
curl might not be a trademark but EU has 'moral right of the author' rules. In my mind libcrurl is right up there with a search engine named G00gle or a software company named MikeRowSoft.
"Crurl" is in "rural juror" territory.
Simple names in the era of the web are not always a good idea. Also see https://www.r-project.org/
See also - Rust