What does Carys mean?
A modern Welsh name formed from the stem of the verb caru 'to love' (compare car 'beloved friend', cariad 'love'). A genuine Welsh 'love' root; the variant Cerys is read the same way.
What does Seren mean?
The modern Welsh word for 'star', a popular girls' name in Wales. (A separate Turkish surname Seren is unrelated.)