User blog comment:TsurugiFan16/Tsurugi Yuuchi's Keshin./@comment-4091102-20120319113022

Perhaps he#ll get kensei lancelot and then he'll evolve.

Here some possibilities for the names of the evolved version: Kesei Lancelot Arc (a bit simple, but maybe), Kensei Gawain

I doubt something related to Merlin, because Lancelot is a knight and merlin a wizard, and I also doubt Arthur, because there is already a keshin related to him.