It is so interesting the things we learn about how we go through day to day life. I totally hear you and empathize with your situation; sometimes I just do not have the energy to explain my name, to someone who really doesn’t care, just to get a damn cup of coffee.
I would even consider Meaghan a dangerous choice because they might ask for the spelling; there are no different versions of the name Lisa, I hope. If Lisa stops working for me, I might have to go even simpler, and start calling myself Sally, Joe or Mike….