I believe it's Are-ee-a.. but I can't remember ^^; I think it's gained popularity from Game of Thrones. My bf wanted to name our daughter that, I liked it, but didn't want to name our baby anything starting with "A" due to the popularity of "A" names lately lol
Quoting SammybXo:" My daughter is Ariah pronounced are ee uh , everyone butchers it though "
Weird, I never thought of Aria as being a pronunciation nightmare... I thought most people would be familiar with the word. I can see how people might think your daughter's is like Mariah without the M, though.