Diggory is familiar to Harry Potter fans as the last name of Cedric Diggory. The name is used in Cornwall, but originates from a Breton medieval poem about Sir Degare. Degare most likely comes from the French word egare - astray. Digory Kirk appears in C.S. Lewis' Chronicles of Narnia, and in Thomas Hardy's The Return of the Native Diggory Venn is an all-around good guy..