Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
We don't have any stats on how common this name is. This is probably because it's very rare in the UK.
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The Delanoy surname in historical dictionaries
Patronymica Britannica (1860)
DELANOY. When Sir Cornelius Vermuyden came to England, temp. Charles I., to drain Hatfield Chase, in Yorkshire, which he had purchased of the crown, and on which he expended £400,000 iu reclaiming and cultivating it, he brought with him from Holland many families as colonists. Among them were the Delanoys, Tafinders, Harnews, Becudas, Morillions, Lelieus, Beharrels, ka., some of whom survive, Avhile others have become extinct.