Modwenna is from the Old Irish mo (my) and the Welsh gwen (white, fair, blessed). Saint Modwenna (d. c. 695) was the Irish-British abbess who founded numerous abbeys across Ireland and England — most famously Burton Abbey on the River Trent. Her cult was popular in medieval England.
Featured in Geoffrey of Burton's Life of Saint Modwenna.
Modwenna reduces to seven — the number of Irish-British saint.