Gavin is a Celtic male given name. It is the Scottish variation of the medieval Welsh name Gawain, meaning "God send" or "white hawk" (or falcon). Sir Gawain was a knight of King Arthur's Round Table. Sir Gawain and the Green Knight is an epic poem connected with King Arthur's Round Table. Gawain beheads the Green Knight who promptly replaces his head and threatens Gawain an identical fate the same time next year. https://en.wikipedia.org/wiki/Gavin