What does Gwilym mean?
Gwilym is the Welsh form of William, “resolute protector.”
What does Bleddyn mean?
From the Welsh 'blaidd' ('wolf', from Proto-Celtic *bledyos) with a suffix, often interpreted as 'wolf hero' or 'little wolf' (the diminutive reading is a popular rather than firmly attested analysis). Borne by the 11th-century prince Bleddyn ap Cynfyn.