Wynn is a form of Wyn, which is derived from gwyn, a Welsh word meaning "white; fair-haired; pure." Wynn
People complain that Welsh names aren't pronounceable. People then seem to pick these same kinds of names for their children. Why not just pick a Welsh pronounceable name instead? And Wynn is a really lovely choice. It sounds soft and brings to mind things like "wind" and "winter." Wynn is just an awesome Welsh name that still works in other English speaking countries and no teachers or future employers will have to stumble over it. So if you like Wynn's style, it works well on many levels. (So does its neighbor Brynn.)
Wynn is a form of Wyn, which is derived from gwyn, a Welsh word meaning "white; fair-haired; pure."