Even though the website seems to have a history of plagiarism I don't think they named the website after HN. By going through their about us section it looks like they started the website in 2010 as a cybersecurity and hacking news platform. The Hacker News is kind of a no-brainer name for this kind of website. Also THN seems to be an Indian website. I think HN was not at all popular outside the Silicon Valley in 2010. So no reason for them to name the website after HN that had an extremely small and passionate userbase. There is a good chance that they may not have even known about HN when they started THN. The name defintely has confused a lot of people though. Even Elon Musk seems to be following THN over HN in Twitter :)