I'm not exactly sure about the origins of these names, which is more common in which neighboring country or territory, as I've always been pretty neutral to them and never gave them much thought to begin with, but I far prefer the look of '
Eileen'
Aileen just never looked really right to me (though I am completely aware that it's a legitimate name and spelling) and it makes me think of the word, Alien as they both have the same letters. /: