My DD is Cerys - very popular Welsh name (my mum is Welsh) Carys and Cerys are both popular there is like Clare and Claire. Pronounced KAH-ris and Cerys is pronounced Keh-ris/Kare-ris. I have never heard it with the -reece ending. I still like it but find in Australia people don't get the hard C and we get more like se-ris or se-reece, or they hear Paris. Particularly non English speakers can't make the leap between seeing a C and it sounding like a K.