it roughly means beast man
its given to hermits and "shape shifters"
Basically people who had A.S.D. (anti social disorder) in ancient times in Celtic lands
there has been many murdlins throughout history but because they were hermits no one knew their names so they called them murdlin or beast men because he lived out in the wild like beast do
I know this because I also suffer from A.S.D. that’s why my nearest neighbor is 10 miles away id probably kill him if I had to get the "morning neighbor" every day