I think the issue is using a generically named algorithm name versus using a persons name that the algorithm is named after could be a different story. In the example, Dijkstra is a surname, ycombinator is essentially just a made up name. So it could be conceivable that the estate or a living person could take issue (legal action) with you using their name. If I really wanted that name, I'd check with an attorney and probably get a release from the estate or living person to utilize their name in my company name, just to avoid any issues.