X with a macron, being a rather unique name in its own right, would likely introduce themselves with an equally unique and memorable greeting. One option might be to jokingly say something along the lines of, "Well, it's a pleasure to meet you, you can call me X with a macron - or if you're feeling extra fancy, you can just call me X-Factor." This greeting is lighthearted and playful, while also highlighting the somewhat unusual nature of X with a macron's name.