A Redditor reportedly emailed Ken Thompson (creator of Unix) about the historical UNICS-to-UNIX name change and received a reply, which is now being shared on social media. The claim itself cannot be independently verified beyond the Reddit post link — there's no corroborating news coverage of this exchange, and Ken Thompson's direct email responses are private communication. That said, this is plausible (Thompson was known to engage with the Unix community) and nixCraft is a credible Unix historian sharing the story, so unverifiable rather than false.