Recently, a prominent leaker claimed that Samsung was to disrupt its long-held flagship-naming convention with a possibly 2020-themed re-brand. Now, another media source claims to have heard that this is in fact the truth. It has allegedly received this confirmation from a "Samsung insider", as well as from a European smartphone distributor.
https://www.notebookcheck.net/The-Galaxy-S11-actually-IS-the-Galaxy-S20-according-to-a-Samsung-insider-tip.450020.0.html
If 2020 is the rationale then we should see the next generation named S21.