This is a beautiful, vintage name! I know it's old-fashioned, but I can picture it on a baby nowadays. It has a sweet nature to it, but a child can grow with it. I will add, in Spanish this would be pronounced corr-DEH-lya (rolling the R). I'm Hispanic myself and this is how I was inclined to pronounce it upon first reading it; I hadn't encountered the other pronunciation. I don't roll the R myself, but I do say DEH-lya. To be clear, I think the English way is just as pretty, DEH-lya is my personal preference.
In both 'Anne of Green Gables' adaptations that I've seen as well as all of both 'Buffy' and 'Angel', this name is consistently pronounced as 'kor-DEEL-ee-ə'. First syllable rhyming with 'or'/'oar', second sounding exactly like 'deal'. I've never heard either of the listed pronunciations.
I will add, in Spanish this would be pronounced corr-DEH-lya (rolling the R).
I'm Hispanic myself and this is how I was inclined to pronounce it upon first reading it; I hadn't encountered the other pronunciation. I don't roll the R myself, but I do say DEH-lya. To be clear, I think the English way is just as pretty, DEH-lya is my personal preference.