After looking it up I'm pretty sure it's a hard "c" as "cœur" is pronounced with a hard "c" when it means "heart".
I don't know if the rule's the same in French but in Spanish the letter "c" is hard when followed by a, o , u and soft when followed by i, or e.
So it's "ca, co cu" (k sound)
and "ce, ci" (s sound)
Here, Brown-eyed, copy and paste this: Jolicœur
That'll work for ya. :Retro smile: