I couldn't resist the moniker. What about this saint's fairness would be so remarkable that he'd be linked with it in name? Was he a judge of some kind, weighing the claims of rival nobles or kings ? Or perhaps the abbot of an especially unruly house?
Nope. He was just the companion of St. Ewald the Black, which reminds me that Clint Eastwood's character in The Good, The Bad, and The Ugly is called Blondie, even though he's not especially fair (in either sense of the word).
But to give the saint his due, I must note that he was "tortured and murdered by Saxons who feared to give up the old religion."