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The only other use of the name I could find is in Nikos Kazantzakis's "Report to Greco". I doubt he made it up but there's no etymology or any other mention of Sourmelina except for an Airbnb listing claiming that it's also the name of a character in another Nikos Kazantzakis book that I'm pretty sure was only referred to as "the widow".
I also searched for Surmela and couldn't find anything.