My question is about etymology of the name "Glen".
Question 1: What is the meaning and root of the name "Glen"?
Question 2: In which regions of Britain is the name "Glen" more frequent to use?
Question 3: Is there any relevance between the name "Glen" and "Gael" people? For example can we consider "Glen" as an abbreviation for the "Gaelean" (a person from Gael people)?