I always assume Ay when written as phonetic pronunciation guide is to be said like hay or stray. If I want to convey the long i sound I usually do "eye" or like that.
Ayla is pronounced like Kayla and Layla. Long a sound. I know this because I read "The Clan of the Cave Bear" and the main character is named Ayla, and it's explained how the name sounds to the Neanderthal people who adopt her.
I guess I'd say Aela the same way.
You're entitled to your own opinions. You're not entitled to your own facts. -- Daniel Patrick Moynihan