http://www.techradar.com/news/samsung-galaxy-s9-could-be-the-last-of-the-s-range

We’re less than a month away from when Samsung will likely unveil the Galaxy S9 and Galaxy S9 Plus, but these could be the last phones from Samsung with ‘S’ in the name, as the company is rumored to call 2019’s model the Samsung Galaxy X rather than the Galaxy S10.

That’s according to “industry researchers and analysts” speaking to Tekz24, and is apparently being done to simplify the naming scheme, so rather than ever growing numbers new handsets would be called, for example, the Samsung Galaxy X (2020).