Welsh John is a name that has been used for several different people throughout history. The first is Evan, a Welsh poet and writer who lived in the 16th century. He is known for his works on Welsh literature and culture. The second is Ewan, a Scottish actor and singer who was born in 1971. He is best known for his roles in films such as Trainspotting and Moulin Rouge. Both Evan and Ewan are associated with the name Welsh John.