I came across the name in my family tree. It’s the Welsh version of Hugh. It’s not a bad name and considering I have Welsh ancestry I like it. I’d probably use the English version for naming a child or use it as a middle name.
Not overly famous, but... In the 2016 BBC TV series 'Class', this is the name of April MacLean's father, a folk singer and fiddle player who spiraled into alcoholism and attempted suicide. He is portrayed by English actor and singer Con O'Neill.