The name reached its all-time peak in 2004 with 5 births ranking #2578. STABLE Recent data shows the name is currently stable.
Delaney comes from a surname with both English and Irish routes. In baby-name use it has the polished, surname-style feel that many modern parents like.
Because the source points to more than one surname origin, Delaney is best explained through that broader surname background rather than by pinning it to one narrow meaning. Its given-name use is modern compared with its older family-name history.