Likely derived from Neil or Neely, from Gaelic roots often interpreted as 'champion' or 'cloud.'
Neily is a tender, diminutive form of Neil, which traces its roots to the ancient Irish name Niall — one of the most storied names in Celtic history. The etymology of Niall is debated among scholars: some link it to the Old Irish "niadh," meaning champion or hero, while others connect it to "nél," meaning cloud. Either lineage carries a certain grandeur.
The legendary Niall of the Nine Hostages, a High King of Ireland in the late 4th or early 5th century, carried the name into myth, and his descendants — the powerful Uí Néill dynasty — shaped Irish politics for centuries. Over time, the Anglicized Neil spread through Scotland and England, worn by poets, philosophers, and astronauts alike. Neil Armstrong's moonwalk in 1969 gave the name an almost cosmic resonance for an entire generation.
Neily, with its soft ending, transforms that heritage into something more intimate and whimsical — a nickname that became a name in its own right, popular in Irish and Scottish households as an affectionate form for both boys and girls. In contemporary naming, Neily occupies a charming space: rooted in deep Celtic tradition but light enough to feel fresh. It suits a child equally at home by an Irish peat fire or in a modern urban apartment, carrying old-world spirit with a gentle, approachable warmth.