Cynewynn

Based on the changes of other forms of Cyneburg (where it's Middle English form became 'Kinborough') and endings of other Old English feminine names ending in -wynn (like -wyn, -wynne, -wen, -wena and -wenna), I imagine that Kinwynn, Kinwyn, Kinwynne, Kinwen, Kinwena and Kinwenna could work as other forms. Unfortunately I can't find sources showing these though.