Reilly
Meaning
from surname O Raghallaigh, traditionally "valiant, courageous"
Popularity, 1890–2024
Shape drawn from US Social Security baby-name records. Reilly peaked in the 2000s and the 2010s in nearly equal measure.
See popularity in Brazil
Popularity in Brazil
93 people · the #43,413 first name in Brazil · median age 9
Among people named Reilly living in Brazil at the 2022 census, more were born in the 2010s than in any other decade.
The census also counted 27 born between 2020 and August 2022, too recent a span to chart.
Source: IBGE, Censo Demográfico 2022
When you meet Reilly
Most people given the name Reilly in the United States are teenagers or young adults today.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
The Reilly deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Reilly truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Reilly fits with your family’s names and surname.
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