In Medieval times there may have very well been a relict population of wild man BUT they certainly did not survive after the 15th century. There are absolutely no accounts of wild men after that. I dealt with regular men and women who were living feral -including in the wilder parts of the UK (hermits almost)- in Some More Things Strange and Sinister.
It is only in the past 7-8 years that there have been such claims from what might be called the fringe of Cryptozoology in the UK. The people I avoid. Knocks and even "calls" I have heard have no comparison with those recorded in the US/Canada. Footprints -fake.
I cannot put it simpler than that. It's just plain rubbish.
Fantasy and money-making.