Interesting. I thought the pronunciation was more phonetic, like A-sling. I like ASH-lyn a little better, but still see it as nothing more than an off-shoot of the uber-popular
Ashley.
Ashlyn and
Ashlynn as less likely to be mispronounced, but seem even more like
Ashley.
Overall, I do think all four,
Aisling,
Aislinn,
Ashlyn, and
Ashlynn, have serious trend potential.