Glyn Family (Glenn)

Adam and Glenn are two good Welsh names. The spelling of Adam in Welsh is Adda. The spelling of Glenn is Glyn. There is also a family spelled Glan. One Glyn family has its origin in Montgomeryshire, an Evan Glyn. Another Glyn family has its origins in the three counties of north Wales above Conway. There is some connection with the Lloyd family. Anyone have additional information?