I live in England, and always thought
Dahlia was Dah-lee-uh, then it turns out my own mother says Day-lee-uh (because of the flower apparently) lol. But I have a cousin
Dahlia, whose name is said the way you want, so I'd just stick with
Dahlia.
Dalia I'd be less inclined to say Dah-Lee-uh, and more likely Dal-ee-uh or even Day-lee-uh.
Wholocked Teen (16) Dreaming of...
✦ Pandora ✦ Lyra ✦ Georgiana ✦ Clara ✦ Fae ✦
✧ Caspian ✧ Phoenix ✧ Ptolemy ✧ Horatio ✧
http://www.behindthename.com/pnl/139644