What is "beuno"

Saint Beuno (; 640), sometimes anglicized as Bono, was a 7th-century Welsh abbot, confessor, and saint. Baring-Gould gives St Beuno's date of death as 21 April 640, making that date his traditional feastday. In the current Roman Catholic liturgical calendar for Wales, he is commemorated on 20 April, the 21st being designated for Saint Anselm.