Meaning:from the alder grove
Delaney has a definite surname feel to it, and sure enough, it was a last name turned into a first. The name was French, De Annou, and anglicized to Delaney. “Annou” was derived from “alder grove,” which was believed by ancient Celtics to have sacred nutritious properties and secret powers. Despite its appealing backstory, Delaney had a late start in the baby-name game. It wasn't recognized until the early 1990s, reaching its peak just after the turn of the century.

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Source: Social Security Administration

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