Irish Gaelic:
* Ey-lan: The "ei" is pronounced like the "ey" in "they," and the "ain" sounds like the "an" in "fan."
Scottish Gaelic:
* Ay-lan: The "a" sounds like the "a" in "father," and the "ain" again sounds like the "an" in "fan."
It's helpful to have a native speaker pronounce it for you to get the most accurate sound.