NameData
Name file · Girl · SSA 1880–2024
Reilly
Reilly is a girl's name.
▼ FallingGeneration Z
5,467
Total named
22
Avg ageestimated
1998
Peak year
#2,723
Rank in 2024
Reilly peaked in 1998, when about 379 girls were given the name. Today it ranks 2,723rd for girls, falling. Most people named Reilly today are around 22 years old (estimated) — squarely Generation Z. In all, roughly 5,467 girls have been named Reilly since record-keeping began in 1978.

📈 Popularity over time

How many girls were named Reilly each year, 1880–2024.
Peak: 1998379 girls198020002020

♀ ♂ A shared name

Reilly is given to both girls and boys. Among everyone with this name:
55% girls
45% boys

↔ Names from the same era

Other girls' names that peaked around the same time as Reilly:
MarlenAdelleAnisaPilarHayleighTayla
Data: U.S. Social Security Administration (public domain), 1880–2024. Average age is estimated from a survival curve, not actuarial tables.
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How we read a name

Every figure on this page comes from the U.S. Social Security Administration's public-domain record of names given to babies born in the United States from 1880 to 2024. The SSA only counts a name in a year if at least five babies received it.

Popularity & rank

The trajectory shows how many girls were named Reilly each year. The peak year is simply the year that count was highest, and the rank is where the name sat among all girls' names in 2024.

Estimated average age

We estimate the typical age of living people with this name by combining how many were born each year with a rough survival curve. It's a useful approximation for "how old does this name feel," not a precise actuarial figure — that's why we always label it estimated.

For general informational and entertainment purposes only. Counts reflect U.S. SSA card applications and may differ from total births. Figures are rounded.